Add moar Pie buttons (1/2)

Added:
-Kill task button
-App window button (credit Steve Spear, just adding another way to
access)

Change-Id: I3f6497b5f5d27379b945392723c3eba597a241da

Conflicts:
	core/java/android/provider/Settings.java
	packages/SystemUI/src/com/android/systemui/statusbar/PieControl.java
	packages/SystemUI/src/com/android/systemui/statusbar/view/PieMenu.java