Some slot were protected or private but needed to be public.
Some needed a static_cast (can't use qOverload because it is in Qt 5.7)
This is not only a partial change.
It would have been much nicer to keep the menu assigned to the
QToolButton, but if one switches away from InstantPopup (to adjust the
entries before they're displayed), the button always gets a menu
indicator that can't be removed.
* Allow creating nameless shares
* Display token as name for nameless shares
(both to be consistent with server)
* Allow changing a share's name by editing it in the table
* Minor adjustments
Starting from oC 10.0.0 having several public link shares with
different attributes for a path will be supported. This adds
functionality to create, edit and delete these public link shares.
The behavior is currently gated by server version, but should be
adapted to use a capability as soon as one is introduced, see
owncloud/core#27622.
The UI reduces to a single-share version when talking to older servers.
Testing scenarios:
* Link sharing is disabled (by capability, not by theme)
* Required passwords
* Required expiry
* Forbidden 'allow upload' for folders
* New and old servers
Now we have 1 simple dialog that includes 2 widgets.
* ShareLinkWidget (for link shares)
* ShareUserGroupWidget (for user/group shares)
The ShareUserGroupWidget is only included if the server version is >=
8.2.0
For <8.2.0 the old behavior is preserved
