v0.15.0

Add support in cooklang::metadata for canonical
metadata, making it
easier to query these keys and expected values.
Add warnings for missused canonical metadata keys.
Improve custom checks for metadata keys. Now they can choose to skip the
included checks too.
Fix ingredients aliases from aisle configuration not being merged in
IngredientList. (#24 @kaylee-kiako)
Remove many dependencies, binaries should be smaller.
(breaking) Change Quantity API.
- value is not a getter.
- unit returns the unit text
- unit_info (new method) returns the Unit value with a runtime lookup.
(breaking) Rename TEMPERATURE extension with INLINE_QUANTITIES. Now all
inline quantities are found, not only temperatures. You may need to update
your application to handle this.

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