Move the switcher Alt+<ArrowKey> shortcut handling into nux, from compiz. Now nux handles these events instead of compiz. This way its makes much more sense code wise and we no longer ungrab the arrow gets from X... so Alt+LeftArrow will no longer open the hud. Fixes: https://bugs.launchpad.net/bugs/969039.
Approved by PS Jenkins bot, Christopher Townsend.