Add wallpaper pickers to seperate package [2/2]

Change-Id: I233b90aa52b5a8c408fa3adfe3bdad07330cc2ad
Conflicts:
	res/xml/lockscreen_interface_settings.xml
	res/xml/theme_settings.xml
Signed-off-by: DHOMD <DHO@dho.im>
Point wallpaper settings (in display - where it F!@$ing belongs) at the common cropper activity

Change-Id: I102c57b34df585b1afe0cc87e1ce328fb376c688