Quick Settings: Swipe to switch

Original Commiter: ThiagoVinicius <https://github.com/ThiagoVinicius>

Ported from Carbon Rom by David96 <xd_e-mail@gmx.de>
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Adds the ability to switch to/from Quick Settings, using a sideways
swipe gesture.

Video demonstration: http://www.youtube.com/watch?v=jZaDVBIFAuA
(Video for the initial Patch Set only)

Patch Set 2: Flip animation follows your finger
Patch Set 3: Fix commit message
Patch Set 4: Fix commit message (again)
Patch Set 5: Pin down the statusbar during swipe
Patch Set 6: Smooth out animation after releasing swipe
Patch Set 7: Swipe in any direction to switch views
Patch Set 8: Ensure the statusbar is properly pinned down
Patch Set 9: Fix logic and event handling issues
Patch Set 10: Refactor for readability
Patch Set 11: Limit swipe detection to the bottom bar

Change-Id: I652fa4023bc5dcb03805f70f2a1e3a7817a7f930