Zope.app.preference

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- Nothing changed yet.

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- Add support for Python 3.7, 3.8, 3.9, 3.10.

- Drop support for Python 3.4.

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- Add support for Python 3.4, 3.5, 3.6 and PyPy.

- Removed test dependency on ``zope.app.zcmlfiles`` and
``zope.app.renderer``, among others. ``zope.app.renderer`` is still
required at runtime.

- Broke test dependency on ``zope.app.testing`` by using
``zope.app.wsgi.testlayer``.

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- Fixed BBB imports which pointed to a not existing `zope.preferences`
package.

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- Depend on split out `zope.preference`.

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- Added HTML labels to ZMI forms.

- Removed `edit.pt` as it seems to be unused.

- Added tests for the ZMI views.