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: Kristofer Ard <kristoferard@gmail.com>

Conflicts:
	core/java/android/provider/Settings.java
	packages/SystemUI/src/com/android/systemui/statusbar/BaseStatusBar.java