Better playlist control with arrow-keys and enter

Also search textbox autofocus
todo: get playlist show/hide shortcut to work even when textbox is focused
Merge branch 'master' into gesture
Made seek/volume gestures work in fullscreen mode
Bolding currently playing file in playlist
Gesture fix particularly to volume gesture
Merge branch 'master' into gesture
Merge remote-tracking branch 'origin/gesture' into tweaks

Conflicts:
	src/ui/mainwindow.cpp