Gesture Anywhere: Add gesture anywhere feature from the ChaOS Lab [1/2]

When enabled a user can activate the gesture anywhere view by touching
the designated trigger area.  If a gesture is recognized as one the user
has created and assigned to an action, that action will be performed.
Since this is part of the system UI and implemented as an overlay, it
will be available and usable system wide, with the exception of the
keyguard for obvious reasons.

Change-Id: Icc2822e1de276bfb2850e885a84edab1ca84cf0d

Gesture Anywhere: Adjust position on orientation change.

Also added hiding home, recent and search from navbar when
showing the GestureAnywhere view.

Change-Id: I1dd13f38af265d6966441f2cd99b78ea9b3d4d90

Gesture anywhere: Collapse if expanded when screen turns off.