After long clicking on a local playlist, show a dialog with 2 options for "rename" and "delete"
Rename shows another dialog to let the user rename the playlist.
Delete lets the user delete a playlist like before.
- add HistoryInfoItem (deriving from StreamInfoItem)
in order to add a special options menu for the list items
- delete HistoryActivity and everything that belongs to its UI (not the
manager tho)
- put everything that is local into local. (subscriptions still missing)