Frameworks: Implement Dynamic System Bars (1/2)

This commit implements DSB. Simple as that.

Change-Id: I3bc7102b2139fd1fa3de22aac096bd2a75bde878

Conflicts:
	core/java/android/provider/Settings.java

Conflicts:
	core/java/android/provider/Settings.java
	packages/SystemUI/res/values/cr_config.xml
	packages/SystemUI/src/com/android/systemui/statusbar/phone/NavigationBarView.java