In File/Share do not show "Add group" if user has no groups
Refs #3575
Visually separate "Private" & "Public" sharing in File/Share
More lightweight than the previous approach.
In File/Share, disable "Add Group" if user has no groups
Also set the button title to "You do not have any groups".Refs #3575
New button "Add everybody" to file Share dialog
In Share Dialog, remove the header line when the permission list is empty.
Change wording: Sharing -> Share in the folder context menu
Update permission table after adding user/group
Rename constructor params
Unify 'Publish' and 'Sharing' dialogs into one (for files)
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