HALO : Ability to enable/disable custom colors

Why? Because, we all know some themers might theme the halo bg or also maybe the speech bubbles, so we trying not to mess with the alternate colors... ;)

Also, the drawable are being color filtered...

Conflicts:
	core/java/android/provider/Settings.java

Change-Id: Ia508aafe4955fa827001d96744b08c4f9ab89296