[Tagtree] Add a new button to list automatically all tracks in all albums of the current view
This feature allow easily to start playing all albums from an artist by following the albums tracks orders, just like the Stock OS does on the iPods when you try to listen to all songs from an artist.
It is just a new opportunity, I did not touch the former "All tracks" button which sorts everything by title automatically since it is also very useful (and stock OS don't have this one, and sorting Alphabetically is very useful to listen to all versions of one track from an artist view).
Change-Id: Icf2a29bffe49c4e72f9c81d9727310b84c1150e4
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