Added ability to create shortcut using "Settings shortcut" widget.

Since this approach ( http://review.cyanogenmod.org/#/c/29265/ ) was not
approved, I would suggest adding the ability to create a shortcut through
the Settings shortuct widget.

Change-Id: Ib8739408dc7bbbdbef3f6d7184b104d2544393f0
Picture: http://i.imgur.com/bud3H.png