Lockscreen custom wallpaper [1/2]

rewritten to work in vanir settings
see http://vaniraosp.goo.im/#/c/10261/ for more info
author: cphelps76<cphelps76@gmail.com>

Change-Id: I27e6dafe5deee77faeb824c6c562131d816cad78

Conflicts:
	res/values/vanir_arrays.xml
	res/values/vanir_strings.xml

Signed-off-by: DHOMD <DHO@dho.im>