OmniSwitch: revamp

-use home and back from lp
-rework kill icons
-disable immersive for now
-replace glow selector with material ripple effect
-change default drag handle color to material green
-use reveal animation for app drawer flip
-cleanup and simplify
-rework position and size settings view

Change-Id: I34cfc3d7e294e21568b356df32cbde5975ddfdc4