Re-work and clean up the Halo style code

Conflicts:

	packages/SystemUI/src/com/android/systemui/statusbar/halo/HaloProperties.java
HALO: Speech bubble color and text color

Change-Id: I02d547af9644145370e132f2ebfaa95298dd6a6c
TODO: Now ditch Halo Style and bring colors instead.... Because, users had a colorful mind. So let's bring in a colorpicker instead...