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

Change-Id: I276bf91156ba66c167011661de1b87d34fc88f4f
Signed-off-by: siracuervo <fl.siracusa@outlook.com.ar>

Conflicts:
	res/drawable-xhdpi/ic_settings_halo.png
	res/values-ko/dokdo_strings.xml