Initial commit of customizable NavBar

5 Customizable navigation buttons, requires ROMControl to
set up.
There are still a few issues to be resolved with this.
Not quite ready to merge/distribute.

Conflicts:

	packages/SystemUI/src/com/android/systemui/statusbar/phone/NavigationBarView.java

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