Statusbar Behaviour (1/2)

This option will allow the user to switch between different statusbar behaviours:
1) Show Statusbar (Always show statusbar)
2) Hide Statusbar (Completely hide statusbar)
3) Notifications (Show statusbar for pending notifications)
4) Pulldown Statusbar + timeout (Show statusbar when pulled down)
5) Pulldown & Notifications (Show statusbar for pending notificaitons or when pulled down)

Credits: SlimRom for their notification statusbar and Slick Rick for his pulldown statusbar.

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

Change-Id: I7eb045448249904b3fa05efec294aa079c1bb432