Add active display

Ring Notifications as implemented on  the Motorola
Moto X.

credit to 0xD34D who i'm assuming wrote most/all of the code.
I found it unfinished/broken in his gerrit and simply fixed it,
improved & optimized a bit

PS2: remove unrelated NavigationBarView diff
PS3: optimizations

Change-Id: Iad6a62a98adc6cc698dc852f1a1477d3ca601e5d

Conflicts:
	core/java/android/provider/Settings.java
	core/res/res/values/symbols.xml
	packages/SystemUI/res/values/dimens.xml
	packages/SystemUI/src/com/android/systemui/statusbar/BaseStatusBar.java
	packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBar.java
	packages/SystemUI/src/com/android/systemui/statusbar/tablet/TabletStatusBar.java