Lockscreen Notifications: dismiss all button, improve animations, cleanup

Change-Id: I77665e37d823c619680312b73d5ebb1e6e437ffd

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

Conflicts:
	core/java/com/android/internal/statusbar/IStatusBar.aidl
	packages/SystemUI/src/com/android/systemui/statusbar/CommandQueue.java