Quick Settings: Swipe to switch

Adds the ability to switch to/from Quick Settings, using a sideways
swipe gesture.

Change-Id: I3cab45f72fe3c5fa40d4631fc6a84ea7bfe51bd1

Patchset: 2
http://review.cyanogenmod.org/#/c/53651/
Add missing permissions for QS

Including upcoming patches for reboot, etc.