Halo: Add master switch to disable Halo (2/2)

Change-Id: Iafde2e47f4d7fdafdf49c475eba26a8437c52089
HALO: Ability to disable/enable custom colors, Effect color added

Conflicts:
	res/values/strings.xml
	res/xml/interface_settings.xml
	src/com/android/settings/carbon/InterfaceSettings.java

Change-Id: I7e924e7decc7e0303d95f9740b9108b477e064a4