Django-rest-framework-braces

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* Added ``EnforceValidationFieldMixin.capture_failed_field``, ``FormSerializerFieldMixin.capture_failed_field``,
and ``FormSerializerBase.capture_failed_fields`` to capture the optional fields that failed.

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* Fixing invalid data being copied over in ``FormSerializer`` when fail mode is not ``fail``

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* Fixing ``DoubleAsStrJsonEncoder`` by subclassing from DRF which supports datetimes, etc

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* Fixing ``SwappingSerializerMixin`` by supporting ``ListSerializer``

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* Added ``SwappingSerializerMixin``.
Allows to declaratively swap fields any field instances in child serializers.
* Added ``DoubleAsStrJsonEncoder`` for handicapped API clients.

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* Fixed how choices are normalized in ``SerializerForm`` to ``[(key, key)]``
vs previously ``[(key, value)]`` to match DRF's handling of choices unlike Django forms.
* Added support for ``Form.all_fields`` and ``Form.all_base_fields``
in ``SerializerForm`` which supports custom form classes which implement such API.
* Added support for ``FormSerializer.Meta.exclude`` which allows to specify fields to exclude.