Add preview player gui
Add a new engine for the preview audio player
Use same media output if crossfading is not used
Add a new needed task to the todo list
Play preview on single click on a title (not tested)
Add a timer to refresh the time stamps in the preview player
Refresh preview time line if diff to much
Fix read me
Fix problem with moving slider bar
Connect preview volume slider (changing wrong value, possiblly bug in gstreamer)
Do not play next track preview
Add todo
Use meda fader for volume control if available to fix a bug in gstreamer
Remove done jobs from todo
Disable volume control if the party mode is active
Do not add track to queue if playlist contains 20 elements and the party mode is activated
Make it possible to disable the preview player
Merge remote-tracking branch 'refs/remotes/origin/partymode'

Conflicts:
	src/AudioControls.cpp
	src/libtomahawk/playlist/QueueView.cpp
Merge branch 'refs/heads/PreviewPlayer'