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