Lockscreen Notifications: dismiss all button, improve animations, cleanup

Conflicts:
	core/java/com/android/internal/statusbar/IStatusBar.aidl
	packages/Keyguard/src/com/android/keyguard/NotificationHostView.java
	packages/Keyguard/src/com/android/keyguard/NotificationViewManager.java
	packages/SystemUI/res/layout-sw600dp/navigation_bar.xml
	packages/SystemUI/res/layout/navigation_bar.xml
	packages/SystemUI/src/com/android/systemui/statusbar/CommandQueue.java
	packages/SystemUI/src/com/android/systemui/statusbar/phone/NavigationBarView.java

Change-Id: I1c32c450bd852d948780d8ad15fe8fe15b23f492