Ftw.file

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- Add support for Plone 5.1. [buchi]

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- DX migration: ignore flowplayer fields (``width`` and ``height``). [jone]

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- Fix ftw.theming integration [mathias.leimgruber]
- Fix incorrect ID in FTI definition. [jone]
- Dexterity migration: import GS profile even when not migrating content. [jone]

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- Add "getContentType" method to ftw.file.File to support legazy code. [mathias.leimgruber]
- Fix ftw.file.File FTI - wrong factory. [mathias.leimgruber]
- Add ftw.theming integration (Icon). [mathias.leimgruber]

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- Move to Dexterity, remove Archetypes functionality (but not models)
[mathias.leimgruber, djowett-ftw]
- Add AT to DX migration step [mathias.leimgruber, djowett-ftw]
- Remove TinyMCE integration [djowett-ftw]
- Rename model fields while migrating to dexterity [djowett-ftw]
- Stop drag and drop upload adding two versions [jone, djowett-ftw]
- Add uninstall profile [djowett-ftw]

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- Improve umlaut support for MSIE file download [busykoala]