Frameworks: move complete keyevents into SlimActions

still to lazy to doe the HW key rebinding revamp but we need
this move as well for that and it is from codeview much cleaner

This commit does:
- move all key event actions into SlimActions
- get rid off ExtensableKeyViewButton class and handle all over
  the AOSP KeyViewButton class which is now reverted nearly to the aosp
  one with slight modifications for the key handling
- fix the double vibrations on home, back and recents
- fix double sound on menu action on PIE and navbar permanent menu buttons
  due that the click sound is played by PhoneWindow.java for ActionBar events
  we do not play our sound for this action
- cleanup a lot unused imports

Change-Id: I7f1862e0e43654837fce4f4085d1ab9aef0558df