ActionHandler: Add moar actions and code cleanup/refresh (1 of 2)

-- Add expand Settings and Notification panels

-- Start on eliminating our BroadcastReceiver in PWM as
   a proxy to execute some actions. The only action we
   can't get to outside of PWM is Power Menu, which may
   be removed. The other actions move into ActionHandler
   where they should be.

-- Cleanup in SystemUI to reflect new handling

-- Hot Reboot: make pkill call directly from ShutdownThread class
   eliminates need to send intent to PWM

-- Formatting: remove indents from non-aosp formatting

-- Navigation bar size, observe uri, don't use intent

-- Home, Back, and Recents (PWM) implementations moved to ActionHandler
   No more local action handling

-- Action contants moved from CFXContants to ActionHandler. These are
   not uris, and action constants should be in the action class

-- Handle Home and Recents locally for hardkeys in PWM, looks like we got
   some wonk creeping in

Change-Id: I1c0ae1e5df42a5a2afe4ccb3f6780596f8e178a4