HALO clearall/silence (STILL NOT READY FOR RELEASE)

but working ...

Change-Id: Ie1c25f4ad60d2fac6321417c6fcf93e3dccd9d93

Conflicts:
	packages/SystemUI/res/drawable-xhdpi/halo_dismiss.png
	packages/SystemUI/src/com/android/systemui/statusbar/halo/Halo.java

Conflicts:

	packages/SystemUI/res/values/strings.xml