Z3c-form

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- Nothing changed yet.

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- Fixed `MultiConverter.toFieldValue` tuple typed field support
(when `field._type` is a tuple of types, not a single type).

- Added Python 3.9 compatibility and testing.

- Applied `zopefoundation.meta` config

- Fixed tests for the `zope.schema.Bool` required default change.

- Fixed tests for the `zope.interface` `repr()` change.

- Fixed compatibility with changed repeat syntax.
Fixes `issue 94 <https://github.com/zopefoundation/z3c.form/issues/94>`_.

- Some fixes in spanish translation.
[erral]

- Drop support for Python 3.4.

- Add support for Python 3.8b4.

- Try to fix the buggy hidden mode behaviour of checkbox widgets.
Fixes `issue 89 <https://github.com/zopefoundation/z3c.form/issues/89>`_.

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- Fix an edge case when field `missing_value` is not `None` but a custom
value that works as `None`.
That ended up calling `zope.i18n` `NumberFormat.format` with `None` what
then failed.

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- Fix ``FieldWidgets.copy()``. It was broken since ``SelectionManager`` was
reimplemented using ``OrderedDict``.

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- Add support for Python 3.7.

- Deal with items with same name but different values in ordered field widget.
[rodfersou]

- Move homegrown Manager implementation to ``OrderedDict``.
[tomgross]

- Adapt tests to `lxml >= 4.2`, `zope.configuration >= 4.3` and
`zope.schema >= 4.7`.

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- Upgrade the major version 4 to reflect the breaking changes in 3.3.0.