Products.cmfdifftool

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New features:

- Add generic `inline_diff` implementation for FieldDiff.
[davisagli]

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New:

- Include fields in additional fieldsets for DX content types
[frapell]

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Fixes:

- Test fixes. [do3cc, pbauer]

- Removed ZopeTestCase tests. [do3cc]

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- Fixed UnicodeDecodeError in dump/ndiff.
Issue https://github.com/plone/Products.CMFPlone/issues/820
[maurits]

- Provide diff for dexterity behaviors' fields.
[cedricmessiant]

- Fix bug with encoding in TextDiff.
[cedricmessiant]

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- Prevent ``AttributeError`` issue when performing diff
on Dexterity contents. Close `330`__.
[keul, cekk]

__ https://github.com/plone/Products.CMFPlone/issues/330

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- Ported tests to plone.app.testing
[tomgross]
- Fix _getValue() bug for dexterity behaviour empty fields.
[sdelcourt]