Global Actions: Add Brightness + Media Actions

    + Brightness Up, Down, Auto
    + Media Next, Previous, Play/Pause
    + Audio Mute

Change-Id: Id0aec7945609ead470ba0737551d6d250b56c9fe
MultiWindows: Fix

Change-Id: I0cc5094d4ba662fd8d0451ef16baf8632d98dc1b
Revert "Deactivate MultiWindow icons by default until fixed"

This reverts commit fcf3a67184a841d7386708aba3fe2eb466d16f97.