Add NavBar Glow, Alpha mods, etc

Change-Id: I494a10ff31c98b1cd88aedaf55957fa69be447af

Conflicts:

	packages/SystemUI/src/com/android/systemui/statusbar/policy/KeyButtonView.java

Conflicts:

	packages/SystemUI/src/com/android/systemui/statusbar/policy/KeyButtonView.java

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