Drf-spectacular

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- ``extend_schema_field`` accepts Serializers and OpenApiTypes
- Generalize query parameter.
- Bugfix serializer init.
- Fix unused get_request_serializer.
- Refactor and robustify typing system.
- Helper scripts for swagger and generator.
- Fix license.

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- Fix parameter type resolution.
- Remove empty parameters.
- Improved assert message.

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- Working release.
- Bugfix wrong call & remove yaml aliases.

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- Initial published version.