Settings : Port lockscreen shortcut configuration

Port lockscreen configuration from cm-10.2

Change-Id: Ib4fd41f747912cc741eca1983c5f56df56176aad
Merge remote-tracking branch 'upstream/cm-11.0' into HEAD

Conflicts:
	src/com/android/settings/cyanogenmod/IconPicker.java
	src/com/android/settings/cyanogenmod/LockscreenTargets.java

Change-Id: I6353a77b20f1ae57e16433b8d16ff1cb445f6fac