Settings : Port lockscreen shortcut configuration (WIP)

Port lockscreen configuration from cm-10.2

Change-Id: Ib4fd41f747912cc741eca1983c5f56df56176aad

Conflicts:

	res/values/cm_strings.xml
	src/com/android/settings/cyanogenmod/LockscreenInterface.java

Patchset: 2
http://review.cyanogenmod.org/#/c/54067/