Products.cmfcore

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- Remove Zope Help System fossils so this products is compatible with Zope 5

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- Fix encoding detection for XML files.
(`85 <https://github.com/zopefoundation/Products.CMFCore/issues/85>`_)

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- Resolve ``docutils`` dependency conflict with ``Zope``.
(`83 <https://github.com/zopefoundation/Products.CMFCore/issues/83>`_)

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- Make sure ``FSFile.__str__`` returns correct native strings under Python 3.
(`76 <https://github.com/zopefoundation/Products.CMFCore/issues/76>`_)

- Add a ``__bytes__`` method to ``FSFile``.

- Add more files types to the FSFile registrations.

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- Set default encoding values on FSDTMLMethods.

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- Fix up all ZMI forms to work better with the Zope 4 ZMI.
(`73 <https://github.com/zopefoundation/Products.CMFCore/issues/73>`_)

- Ensure Content Type Registries don't use a ZMI add dialog in the Zope 4 ZMI.
(`72 <https://github.com/zopefoundation/Products.CMFCore/issues/72>`_)