Vanir Halo 2/2

Rewrite of the original PA feature for 4.4 with Vanir changes.

Change-Id: I04a735f7547e796f48856d5e9e743668d9a21706
PS-1: initial
PS-2: fix breakage
PS-3: modify color settings to hide when unchecked
PS-4: add swanky on/off switch in actionbar