Return: Smart Pulldown [1/2]

Adds the ability to directly open the QS panel when there are
no notifications present in the notification panel.
This commit combines the enhancement by HardCorePawn for detectin
notification types for the same.

Credits: kufikugel, HardCorePawn

PS 2-4 : Cleanup

Adapted to LP

Added Jubakubas commit

SystemUI: Smart Pull-Down - Any Notification (1/2)

PS
- fixed logic to go inline with all mode in settings - should be fixed on kk as well

Change-Id: I3c9b048f2616d2b8950930cc5bfac27c2364e826

Conflicts:
	core/java/android/provider/Settings.java
	packages/SystemUI/src/com/android/systemui/statusbar/phone/NotificationPanelView.java