port forward: 'Set navbar background and statusbar background back to a drawable by default (1/2)
but add in options for color alpha, default bg plus color/alpha, or default bg only. Choosen by user.
This will make themes that theme navbar/statusbar background work correctly if set to default of course. Plus maintain the choice of user selectable color/alpha.'

Conflicts:

	core/java/android/provider/Settings.java
	packages/SystemUI/res/layout/status_bar.xml
	packages/SystemUI/res/values/colors.xml
	packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBar.java
	packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBarView.java