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/src/com/android/systemui/statusbar/BaseStatusBar.java
	packages/SystemUI/src/com/android/systemui/statusbar/CommandQueue.java
	packages/SystemUI/src/com/android/systemui/statusbar/phone/NavigationBarView.java