Lockscreen notifications: Add "show all notifications" navbar button

Change-Id: I0cd5b13e5644de36d24d4d693838bd7080f55412
Lockscreen Notifications: dismiss all button, improve animations, cleanup

Change-Id: I77665e37d823c619680312b73d5ebb1e6e437ffd

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