Lockscreen: Add clock alignment (2/2)

Settings part, check frameworks part for more info and screenshots.

Patch-set 2: Fix whitespace in strings
Patch-set 3: Rebased
Patch-set 4: Fix inline comments
Patch-set 5: Fix preference not changing

Change-Id: Ice0ac48d1d04477e9dbbf0c60bd4f240d1f00a3e

Conflicts:
	res/values/arrays.xml
	res/values/strings.xml
	res/xml/lockscreen_interface_settings.xml
	src/com/android/settings/cyanogenmod/LockscreenInterface.java