Halo: Add master switch to disable Halo (1/2)
-Port master switch from @Der-Schubi.
-Fixed Halo not showed at first notifiction pulldown.

Signed-off-by: PipelinerArd <kristoferard@gmail.com>
Signed-off-by: Kristofer Ard <kristoferard@gmail.com>

Conflicts:
	core/java/android/provider/Settings.java