Yatiml

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New functionality
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* Added fix_union_bool type for fixing Union[int, bool] on Python < 3.7
* Added support for Python 3.7

Fixes
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* Return scalar values with the correct type

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New functionality
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* Extended map_to_seq seasoning
* Support for YAML timestamp / Python datetime
* Support for YAML keys with dashes

Fixes
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* Much improved error messages

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New functionality
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* Support for classes that are represented by a string in the YAML file
* New unified yatiml.Node interface (API change)

Fixes
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* Small improvements to documentation
* Miscellaneous small fixes

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New functionality
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* Support for enumerations
* Support for user-defined string types

Fixes
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* Various small tooling fixes
* Some refactoring

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* Initial release with basic functionality