Settings: Add proximity wake option

Ports and combines:

http://review.cyanogenmod.org/#/c/66658/
Settings : Add preference for proximity wake

http://review.cyanogenmod.org/#/c/69347/
Proximity Wake-Up : adjust strings

http://review.cyanogenmod.org/#/c/69803/
Settings : Make proximity opt-in

Change-Id: Iea0853eccf764438c7aaac76afd13c364fcea0ec
Settings: Port "Development shortcut" (1/2)

New setting under "Debug settings" that enables the development shortcut
Change-Id: I9a43e611911f2e278605715f714860ad11236fd9

Modify the Development shortcut help text
Change-Id: Iaa6d87f5044a46e8c0f8d88a4fc9bf9a494188b8

Change-Id: I9a43e611911f2e278605715f714860ad11236fd9