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

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

Change-Id: I3c9b048f2616d2b8950930cc5bfac27c2364e826