Optimized all png's.

Change-Id: I6b9a374b08a567e92c024df8d16844e7859f8cf7
to: optipng -nc -nb -o7
Stweaks Support

Change-Id: I5ea72126ba84a2e2346fcbeb55ece5117ea1fdc7
Overlay: Use fade out animation instead of crt-off animation

Change-Id: Ib98a70ec828965ab38a333653cf9a1ebaae050f7