QuickSettings : Add BatterySaver Tile (1/2)

Conflicts:
	core/java/com/android/internal/util/liquid/QSConstants.java
	packages/SystemUI/src/com/android/systemui/statusbar/phone/QuickSettingsController.java

Conflicts:
	core/java/com/android/internal/util/ose/QSConstants.java
	packages/SystemUI/src/com/android/systemui/statusbar/phone/QuickSettingsController.java