Enhancement: Add config option for hoverable quick actions

We've added the possibility to add hover effect for quick actions with the option "hoverableQuickActions" in config.json. The hover effect applies to "edit name", "add people" and "copy quicklink" actions in the corresponding hovered row.

https://github.com/owncloud/web/pull/7022
https://github.com/owncloud/web/issues/7021
