Wildcard-foldercontents

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- another update so it doesn't bork on old browsers that doesn't support the
File API
[vangheem]

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- sync with latest: tus resumable large file upload support
[vangheem]

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- fix upload button to upload to current directory
[vangheem]

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- sync with latest: add sorting, actions column, other fixes
[vangheem]

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- update to latest mockup project code
[vangheem]

- handle unicode filesnames for dexterity file uploads
[vangheem]

- just always default to using File objects for uploads that aren't images.
[vangheem]

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- change this package into being a backport of the plone 5 folder contents
[vangheem]