Cleanup and bug fixes in StackView

-> pushed functionality from AdapterViewAnimator to StackView
-> only modifying clipping flags as far up the view
   hierarchy as needed
-> still need framework level solution for drawing outside bounds

ViewGroup touch dispatch temp fix
-> Touch event was being modified and not reset in some
   code paths.

Change-Id: I8135b62e2d73f239b9df407b0fa93bc434796989