Changelog for Cldr_Units v3.5.0

This is the changelog for Cldr_units v3.5.0 released on April 8th, 2021. For older changelogs please consult the release tag on GitHub

Overview

In this release the Cldr.Unit.to_string/{1, 2, 3} function has been rewritten and the concrete impementation is now in Cldr.Unit.Format. The primary reasons for rewriting are:

Improves performance by 20% over the old implementation.
Supports grammatical case and grammatical gender. These allow for better sentence formation in a localised fashion. Only are few locales have the required data for now (for example, fr and de) however more locales will have data in upcoming CLDR releases.

Note that full testing of grammatical case and grammatical gender variations is not yet complete.

Soft Deprecation

The function Cldr.Unit.to_iolist/{1, 2, 3} is soft deprecated. It is still available and no deprecation warning is emitted. It will however be removed from the public API in a future release. This function is primarily used to support implementation of Cldr.Unit.to_string/3
As of this release, argument checking in Cldr.Unit.to_iolist/3 is less rigorous in order to avoid the relatively expensive argument normalization process happening twice (once in Cldr.Unit.to_string/3 and then again in Cldr.Unit.to_iolist/3).

Bug Fixes

The new string formatter correctly assembles units with an SI prefix (ie millimeter) in languages such as German where the noun is capitalized.
Fixes calculating the base unit when the unit is a complex compound unit.
Remove double parsing when calling Cldr.Unit.new/2 and the unit is not in Cldr.Unit.known_units/0
Ensure Cldr.Unit.unit_category/1 returns an error tuple if the category is unknown

Enhancements

Updated to require ex_cldr version 2.20 which includes CLDR 39 data.
Add Cldr.Unit.validate_grammatical_gender/2
Add Cldr.Unit.known_grammatical_cases/0
Add Cldr.Unit.known_grammatical_genders/0
Add Cldr.Unit.known_measurement_system_names/0
Add Cldr.Unit.invert/1 to invert a "per" unit. This allows for increased compatibility for conversions. For example, "liters per 100 kilometers" is a measure of consumption, as is "miles per gallon". However these two units are not convertible without inverting one of them first since one is "volume per length" and the other is "length per volume".
Add Cldr.Unit.conversion_for/2 to return a conversion list used when converting one unit to another.
Add Cldr.Unit.grammatical_gender/2 to return the grammatical gender for a given unit and locale
Add Cldr.Unit.conversion_for/2 to return a conversion list used when converting one unit to another.
Add support for grammatical cases for Cldr.Unit.to_string/2 and Cldr.Unit.to_iolist/2. Not all locales support more than the nominative case. The nominative case is the default. Any configured "Additional Units" in a backend module will need to be modified to put the localisations a map with the key :nominative. See the readme for more information on migrating additional units. On example is:
```
defmodule MyApp.Cldr do
use Cldr.Unit.Additional

use Cldr,
  locales: ["en", "fr", "de", "bs", "af", "af-NA", "se-SE"],
  default_locale: "en",
  providers: [Cldr.Number, Cldr.Unit, Cldr.List]
unit_localization(:person, "en", :long,
  nominative: %{
    one: "{0} person",
    other: "{0} people"
  },
  display_name: "people"
)
```

end


* Support conversions where one of the base units is the inverted conversion of the other. This allows conversion between, for example, `mile per gallon` and `liter per 100 kilometer`. These are both compound units of `length` and `volume` but are inverse representations from each other.

# Changelog for Cldr_Units v3.5.0-rc.1

This is the changelog for Cldr_units v3.5.0-rc.1 released on March 21st, 2021.  For older changelogs please consult the release tag on [GitHub](https://github.com/elixir-cldr/cldr_units/tags)

### Overview

In this release the `Cldr.Unit.to_string/{1, 2, 3}` function has been rewritten and the concrete impementation is now in `Cldr.Unit.Format`.  The primary reasons for rewriting are:

1. Improves performance by 20% over the old implementation.
2. Supports grammatical case and grammatical gender. These allow for better sentence formation in a localised fashion. Only are few locales have the required data for now (for example, `fr` and `de`) however more locales will have data in upcoming CLDR releases.

Note that full testing of grammatical case and grammatical gender variations is not yet complete.

### Soft Deprecation

* The function `Cldr.Unit.to_iolist/{1, 2, 3}` is soft deprecated. It is still available and no deprecation warning is emitted. It will however be removed from the public API in a future release. This function is primarily used to support implementation of `Cldr.Unit.to_string/3`

* As of this release, argument checking in `Cldr.Unit.to_iolist/3` is less rigorous in order to avoid the relatively expensive argument normalization process happening twice (once in `Cldr.Unit.to_string/3` and then again in `Cldr.Unit.to_iolist/3`).

### Bug Fixes

* The new string formatter correctly assembles units with an SI prefix (ie `millimeter`) in languages such as German where the noun is capitalized.

# Changelog for Cldr_Units v3.5.0-rc.0

This is the changelog for Cldr_units v3.5.0-rc.0 released on March 19th, 2021.  For older changelogs please consult the release tag on [GitHub](https://github.com/elixir-cldr/cldr_units/tags)

### Bug Fixes

* Fixes calculating the base unit when the unit is a complex compound unit.

* Remove double parsing when calling `Cldr.Unit.new/2` and the unit is not in `Cldr.Unit.known_units/0`

* Ensure `Cldr.Unit.unit_category/1` returns an error tuple if the category is unknown

### Enhancements

* Updated to require [ex_cldr version 2.20](https://hex.pm/packages/ex_cldr/2.20.0) which includes [CLDR 39](http://cldr.unicode.org/index/downloads/cldr-39) data.

* Add `Cldr.Unit.known_grammatical_cases/0`

* Add `Cldr.Unit.known_grammatical_genders/0`

* Add `Cldr.Unit.known_measurement_system_names/0`

* Add `Cldr.Unit.invert/1` to invert a "per" unit. This allows for increased compatibility for conversions. For example, "liters per 100 kilometers" is a measure of consumption, as is "miles per gallon".  However these two units are not convertible without inverting one of them first since one is "volume per length" and the other is "length per volume".

* Add `Cldr.Unit.conversion_for/2` to return a conversion list used when converting one unit to another.

* Add `Cldr.Unit.grammatical_gender/2` to return the grammatical gender for a given unit and locale

* Add `Cldr.Unit.conversion_for/2` to return a conversion list used when converting one unit to another.

* Add support for grammatical cases for `Cldr.Unit.to_string/2` and `Cldr.Unit.to_iolist/2`. Not all locales support more than the nominative case. The nominative case is the default. Any configured "Additional Units" in a backend module will need to be modified to put the localisations a map with the key `:nominative`.  See the readme for more information on migrating additional units.  On example is:

defmodule MyApp.Cldr do use Cldr.Unit.Additional

use Cldr,

locales: ["en", "fr", "de", "bs", "af", "af-NA", "se-SE"],
default_locale: "en",
providers: [Cldr.Number, Cldr.Unit, Cldr.List]

unit_localization(:person, "en", :long,

nominative: %{
  one: "{0} person",
  other: "{0} people"
},
display_name: "people"

) end


* Support conversions where one of the base units is the inverted conversion of the other. This allows conversion between, for example, `mile per gallon` and `liter per 100 kilometer`. These are both compound units of `length` and `volume` but are inverse representations from each other.

# Changelog for Cldr_Units v3.4.0

This is the changelog for Cldr_units v3.4.0 released on February 9th, 2021.  For older changelogs please consult the release tag on [GitHub](https://github.com/elixir-cldr/cldr_units/tags)

### Bug Fixes

* Fix readme example for `MyApp.Cldr.Unit.convert/2`.  Thanks to @DamienFF. Closes #16.

* Add missing `<backend>.convert!/2`

### Enhancements

* Supports the definition of custom units in `config.exs`.

* Add `Cldr.Unit.display_name/2`

* Add `Cldr.Unit.known_units_by_category/0`

* Add `Cldr.Unit.known_units_for_category/1`

* Add `Cldr.Unit.measurement_system_units/0`

* Add `Cldr.Unit.measurement_system_from_locale/{2, 3}`

* Add `Cldr.Unit.measurement_system_for_territory/1`

* Add `Cldr.Unit.measurement_systems_for_unit/1`

* Improve `Cldr.Unit.IncompatibleUnit` exception error message

* Deprecate `Cldr.Unit.measurement_systems/0` in favour of `Cldr.Unit.measurement_systems_by_territory/0`

* Requires `ex_cldr` version `~> 2.19` which includes the localised display name of units

# Changelog for Cldr_Units v3.3.1

This is the changelog for Cldr_units v3.3.1 released on November 3rd, 2020.  For older changelogs please consult the release tag on [GitHub](https://github.com/elixir-cldr/cldr_units/tags)

### Bug Fixes

* Fix `Cldr.Unit.localize/2` when no options are provided

# Changelog for Cldr_Units v3.3.0

This is the changelog for Cldr_units v3.3.0 released on November 1st, 2020.  For older changelogs please consult the release tag on [GitHub](https://github.com/elixir-cldr/cldr_units/tags)

### Enhancements

* Update to [CLDR38](http://cldr.unicode.org/index/downloads/cldr-38)

# Changelog for Cldr_Units v3.2.1

This is the changelog for Cldr_units v3.2.1 released on September 26th, 2020.  For older changelogs please consult the release tag on [GitHub](https://github.com/elixir-cldr/cldr_units/tags)

### Bug Fixes

* Use `Cldr.default_backend!/0` when available (as in later ex_cldr releases) since `Cldr.default_backend/0` is deprecated.

# Changelog for Cldr_Units v3.2.0

This is the changelog for Cldr_units v3.2.0 released on September 5th, 2020.  For older changelogs please consult the release tag on [GitHub](https://github.com/elixir-cldr/cldr_units/tags)

### Enhancements

* Support string form of unit usage when passed as option `:usage` to `Cldr.Unit.new/3`. This is required to support improved serialization in [ex_cldr_units_sql](https://hex.pm/packages/ex_cldr_units_sql)

### Bug Fixes

* Correct the documentation to reflect the option `:usage` to `Cldr.Unit.new/3` rather than the incorrect `:use`.

* Fix spec for `Cldr.Units.compatible?/2`. Thanks to @lostkobrakai.

# Changelog for Cldr_Units v3.1.2

This is the changelog for Cldr_units v3.1.2 released on August 29th, 2020.  For older changelogs please consult the release tag on [GitHub](https://github.com/elixir-cldr/cldr_units/tags)

### Bug Fixes

* Fixes dialyzer warning on `Cldr.Unit.to_string/3` and `Cldr.Unit.to_string!/3`. Thanks to @maennchen for the report. Closes #15.

* Support `Decimal` numbers in `Cldr.Unit.to_string/3` and `Cldr.Unit.to_string!/3`.

# Changelog for Cldr_Units v3.1.1

This is the changelog for Cldr_units v3.1.1 released on June 29th, 2020.  For older changelogs please consult the release tag on [GitHub](https://github.com/elixir-cldr/cldr_units/tags)

### Bug Fixes

* Ensure that `:locale` is passed through to `Cldr.Number.to_string/3`. Thanks for the PR to @Zurga. Closes #14.

# Changelog for Cldr_Units v3.1.0

This is the changelog for Cldr_units v3.1.0 released on May 18th, 2020.  For older changelogs please consult the release tag on [GitHub](https://github.com/elixir-cldr/cldr_units/tags)

### Enhancements

* Add `Cldr.Unit.to_iolist/3` and `Cldr.Unit.to_iolist!/3` to return the formatted unit as an iolist rather than a string. This allows for formatting the number and the unit name differently. It also allows some efficiency in inserting formatted content into a Phoenix workflow since it handles iolists efficiently.

### Bug Fixes

* Fix resolving translatable unit names from strings

* Fix converting translatable units that have a "per" conversion

# Changelog for Cldr_Units v3.0.1

This is the changelog for Cldr_units v3.0.1 released on May 15th, 2020.  For older changelogs please consult the release tag on [GitHub](https://github.com/elixir-cldr/cldr_units/tags)

### Bug Fixes

* Corrects unit creation when the unit itself is directly translatable (like `:kilowatt_hour`) but there is no explicit conversion, just an implicit calculated conversion. Thanks to @syfgkjasdkn.

# Changelog for Cldr_Units v3.0.0

This is the changelog for Cldr_units v3.0.0 released on May 4th, 2020.  For older changelogs please consult the release tag on [GitHub](https://github.com/elixir-cldr/cldr_units/tags)

### Summary

* New unit creation including rational numbers

* Base unit calculation

* New unit preferences

* New conversion engine

### Breaking changes

* `Cldr.Unit.new/2` is now `Cldr.Unit/{2, 3}` and it returns a standard `{:ok, unit}` tuple on success. Use `Cldr.Unit.new!/{2,3}` if you want to retain the previous behaviour.

* Removed `Cldr.Unit.unit_tree/0`

* Removed `Cldr.Unit.units/1`

* Removed `Cldr.Unit.compatible_units/2`

* Removed `Cldr.Unit.best_match/1`

* Removed `Cldr.Unit.jaro_match/1`

* Removed `Cldr.Unit.unit_category_map/0` (replaced with `Cldr.Unit.base_unit_category_map/0`)

### Deprecations

* Deprecate `Cldr.Unit.unit_categories/0` in favour of `Cldr.Unit.known_unit_categories/0` to be consistent across CLDR.

### Enhancements

* Incorporate CLDR's unit conversion data into the new conversion engine

* Unit values may now be rational numbers.  Conversion data and the results of conversions are executed and retained as rationals. New units can be created with integer, float, Decimal or rational numbers. Conversion to floats is done only when the unit is output via `Cldr.Unit.to_string/3` or explicitly through the new function `Cldr.Unit.ratio_to_float/1`

* Add an option `:usage` to `Cldr.Unit.new/{2,3}`. This defines an expected usage for a given unit that will be applied during localization. The default is `:default`. See `Cldr.Unit.unit_category_map/0` for what usage is defined for a unit category.

* Add `Cldr.Unit.known_measurement_sytems/0` to return the known measurement systems

* Add `Cldr.Unit.Conversion.preferred_units/3` that returns a list of preferred units for a given unit. This makes it straight forward to take a unit and convert it to the units preferred by the user for a given unit type, locale and use case.

* Add `Cldr.Unit.base_category_map/0` that maps base units to their unit categories. For example, map `mile_per_hour` to `:speed` or `kilogram_square_meter_per_cubic_second_ampere` to `:voltage`. Base units are derived from a unit name and are not normally the concern of the consumer of `ex_cldr_units`.

# Changelog for Cldr_Units v2.8.1

This is the changelog for Cldr_units v2.8.1 released on April 25th, 2020.  For older changelogs please consult the release tag on [GitHub](https://github.com/elixir-cldr/cldr_units/tags)

### Enhancements

* Updates data management to be compatible with data from both both CLDR 36 (ex_cldr 2.13) and CLDR 37 (ex_cldr 2.14)

# Changelog for Cldr_Units v2.8.0

This is the changelog for Cldr_units v2.8.0 released on January 27th, 2020.  For older changelogs please consult the release tag on [GitHub](https://github.com/elixir-cldr/cldr_units/tags)

### Enhancements

* Support the new `Enum.sort/2` in Elixir 1.10. The function `Cldr.Math.cmp/2` is deprecated in favour of `Cldr.Math.compare/2` that has the same function signature and returns the same result that is compatible with Elixir 1.10.

* Adds `Cldr.Unit.compare/2` that is required for `Enum.sort/2` to work as expected with units.

As an example:

iex> alias Cldr.Unit Cldr.Unit

iex> unit_list = [Unit.new(:millimeter, 100), Unit.new(:centimeter, 100), Unit.new(:meter, 100), Unit.new(:kilometer, 100)] [#Unit<:millimeter, 100>, #Unit<:centimeter, 100>, #Unit<:meter, 100>, #Unit<:kilometer, 100>]

iex> Enum.sort unit_list, Cldr.Unit [#Unit<:millimeter, 100>, #Unit<:centimeter, 100>, #Unit<:meter, 100>, #Unit<:kilometer, 100>]

iex> Enum.sort unit_list, {:desc, Cldr.Unit} [#Unit<:kilometer, 100>, #Unit<:meter, 100>, #Unit<:centimeter, 100>, #Unit<:millimeter, 100>]

iex> Enum.sort unit_list, {:asc, Cldr.Unit} [#Unit<:millimeter, 100>, #Unit<:centimeter, 100>, #Unit<:meter, 100>, #Unit<:kilometer, 100>]


# Changelog for Cldr_Units v2.7.0

This is the changelog for Cldr_units v2.7.0 released on October 10th, 2019.  For older changelogs please consult the release tag on [GitHub](https://github.com/elixir-cldr/cldr_units/tags)

### Enhancements

* Update [ex_cldr](https://github.com/elixir-cldr/cldr) to version `2.11.0` which encapsulates [CLDR](https://cldr.unicode.org) version `36.0.0` data.

* Update minimum Elixir version to `1.6`

* Adds conversion for `newton meter`, `dalton`, `solar luminosity`, `pound foot`, `bar`, `newton`, `electron volt`, `barrel`, `dunam`, `decade`, `mole`, `pound force`, `megapascal`, `pascal`, `kilopascal`, `solar radius`, `therm US`, `British thermal unit`, `earth mass`.

# Changelog for Cldr_Units v2.6.1

This is the changelog for Cldr_units v2.6.1 released on August 31st, 2019.  For older changelogs please consult the release tag on [GitHub](https://github.com/elixir-cldr/cldr_units/tags)

### Bug Fixes

* Fix `Cldr.Unit.to_string/3` to ensure that `{:ok, string}` is returned when formatting a list of units

# Changelog for Cldr_Units v2.6.0

This is the changelog for Cldr_units v2.6.0 released on August 25th, 2019.  For older changelogs please consult the release tag on [GitHub](https://github.com/elixir-cldr/cldr_units/tags)

### Enhancements

* Add `Cldr.Unit.localize/3` to support converting a given unit into units that are familiar to a given territory. For example, given a unit of `#Unit<2, :meter>` is would normally be expected to show this as `[#Unit<:foot, 5>, #Unit<:inch, 11>]`. The data to support these conversions is returned by `Cldr.Unit.unit_preferences/0`. An example:

iex> height = Cldr.Unit.new(1.8, :meter) iex> Cldr.Unit.localize height, :person, territory: :US, style: :informal [#Unit<:foot, 5>, #Unit<:inch, 11>]


  * Note that conversion is dependent on context. The context above is `:person` reflecting that we are referring to the height of a person. For units of `length` category, the other contexts available are `:rainfall`, `:snowfall`, `:vehicle`, `:visibility` and `:road`. Using the above example with the context of `:rainfall` we see

iex> Cldr.Unit.localize height, :rainfall, territory: :US [#Unit<:inch, 71>]


* Adds a `:per` option to `Cldr.Unit.to_string/3`. This option leverages the `per` formatting style to allow compound units to be printed.  For example, assume want to emit a string which represents "kilograms per second". There is no such unit defined in CLDR (or perhaps anywhere!). But if we define the unit `unit = Cldr.Unit.new(:kilogram, 20)` we can then execute `Cldr.Unit.to_string(unit, per: :second)`.  Each locale defines a specific way to format such a compount unit.  Usually it will return something like `20 kilograms/second`

* Adds `Cldr.Unit.unit_preferences/0` to map units into a territory preference alternative unit

* Adds `Cldr.Unit.measurement_systems/0` that identifies the unit system in use for a territory

* Adds `Cldr.Unit.measurement_system_for/1` that returns the measurement system in use for a given territory.  The result will be one of `:metric`, `:US` or `:UK`.

### Deprecation

* Add `Cldr.Unit.unit_category/1` and deprecate `Cldr.Unit.unit_type/1` in order to be consistent with the nomenclature of CLDR

# Changelog for Cldr_Units v2.5.3

This is the changelog for Cldr_units v2.5.3 released on August 23rd, 2019.  For older changelogs please consult the release tag on [GitHub](https://github.com/elixir-cldr/cldr_units/tags)

### Bug Fixes

* Fix `@spec` for `Cldr.Unit.to_string/3` and `Cldr.Unit.to_string!/3`

# Changelog for Cldr_Units v2.5.2

This is the changelog for Cldr_units v2.5.2 released on August 21st, 2019.  For older changelogs please consult the release tag on [GitHub](https://github.com/elixir-cldr/cldr_units/tags)

### Bug Fixes

* Replace `Cldr.get_current_locale/0` with `Cldr.get_locale/0`in docs

* Fix dialyzer warnings

# Changelog for Cldr_Units v2.5.1

This is the changelog for Cldr_units v2.5.1 released on June 18th, 2019.  For older changelogs please consult the release tag on [GitHub](https://github.com/elixir-cldr/cldr_units/tags)

### Enhancements

* Standardize the development cldr backend as `MyApp.Cldr` which makes for more understandable and readable examples and doc tests

* `Cldr.Unit.to_string/3` now allows for the `backend` parameter to default to `Cldr.default_backend/0`

# Changelog for Cldr_Units v2.5.0

This is the changelog for Cldr_units v2.5.0 released on March 28th, 2019.  For older changelogs please consult the release tag on [GitHub](https://github.com/elixir-cldr/cldr_units/tags)

### Enhancements

* Updates to [CLDR version 35.0.0](http://cldr.unicode.org/index/downloads/cldr-35) released on March 27th 2019.

# Changelog for Cldr_Units v2.4.0

This is the changelog for Cldr_units v2.4.0 released on March 23rd, 2019.  For older changelogs please consult the release tag on [GitHub](https://github.com/elixir-cldr/cldr_units/tags)

### Enhancements

* Supports `Cldr.default_backend()` as a default for `backend` parameters in `Cldr.Unit`

# Changelog for Cldr_Units v2.3.3

This is the changelog for Cldr_units v2.3.2 released on March 23rd, 2019.  For older changelogs please consult the release tag on [GitHub](https://github.com/elixir-cldr/cldr_units/tags)

### Bug Fixes

* Include `priv` directory in the hex package (thats where the conversion json exists)

# Changelog for Cldr_Units v2.3.2

This is the changelog for Cldr_units v2.3.2 released on March 20th, 2019.  For older changelogs please consult the release tag on [GitHub](https://github.com/elixir-cldr/cldr_units/tags)

### Bug Fixes

* Fix dialyzer warnings

# Changelog for Cldr_Units v2.3.1

This is the changelog for Cldr_units v2.3.1 released on March 15th, 2019.  For older changelogs please consult the release tag on [GitHub](https://github.com/elixir-cldr/cldr_units/tags)

### Enhancements

* Makes generation of documentation for backend modules optional.  This is implemented by the `:generate_docs` option to the backend configuration.  The default is `true`. For example:

defmodule MyApp.Cldr do use Cldr,

default_locale: "en-001",
locales: ["en", "ja"],
gettext: MyApp.Gettext,
generate_docs: false

end


# Changelog for Cldr_Units v2.3.0

This is the changelog for Cldr_units v2.3.0 released on March 4th, 2019.  For older changelogs please consult the release tag on [GitHub](https://github.com/elixir-cldr/cldr_units/tags)

### Enhancements

* The conversion tables are now stored as json and updates may be downloaded at any time with the mix task `mix cldr.unit.download`. This means that updates to the conversion table may be made without requiring a new release of `Cldr.Unit`.

# Changelog for Cldr_Units v2.2.0

This is the changelog for Cldr_units v2.2.0 released on February 24th, 2019.  For older changelogs please consult the release tag on [GitHub](https://github.com/elixir-cldr/cldr_units/tags)

### Enhancements

This release is primarily about improving the conversion of units without introducing precision errors that accumulate for floats. The strategy is to define the conversion value between individual unit pairs.

Currently the implementation uses a static map.  In order to give users a better experience a future release will allow for both specifying mappings as a parameter to `Cldr.Unit.convert/2` and as compile time configuration options including the option to download conversion tables from the internet.

* Direct conversions are now supported. For some calculations, the process of diving and multiplying by conversion factors produces an unexpected result. Some direct conversions are now defined which produce a more expected result.

* In most cases, return integer values from conversion and decomposition when the originating unit value is also an integer

# Changelog for Cldr_Units v2.1.0

This is the changelog for Cldr_units v2.1.0 released on December 8th, 2018.  For older changelogs please consult the release tag on [GitHub](https://github.com/elixir-cldr/cldr_units/tags)

### Enhancements

* Add `Cldr.Unit.Conversion.convert!/2`

* Add `Cldr.Unit.Math.cmp/2`

* Add `Cldr.Unit.decompose/2`

* Add `Cldr.Unit.zero/1`

* Add `Cldr.Unit.zero?/1`

The appropriate backend equivalents are also added.

# Changelog for Cldr_Units v2.0.0

This is the changelog for Cldr_units v2.0.0 released on November 24th, 2018.  For older changelogs please consult the release tag on [GitHub](https://github.com/elixir-cldr/cldr_units/tags)

### Breaking changes

* `Cldr.Unit` now requires a `Cldr` backend module to be configured

* In order for the `String.Chars` protocol to be supported (which is used in string interpolation and by `Kernel.to_string/1`) a default backend must be configured.  For example in `config.exs`:

config :ex_cldr_units, default_backend: MyApp.Cldr


### Enhancements

* Move to a backend module structure with [ex_cldr](https://hex.pm/packages/ex_cldr) version 2.0

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