Add launcher configuration item - CM

This was jumbled together with a ton of lockscreen stuff that needs
to be fully remade, so I just give up on rebasing it in. Just
add the feature.

PS - #$%#@^% squashed commits for separate features...

Change-Id: I4820edc7710206174b082ace542d76ec459559db

Conflicts:
	res/values/strings.xml
	res/xml/settings_headers.xml
	src/com/android/settings/Settings.java