base: fixed offscreen volume key handling

http://jira.omnirom.org/browse/OMNI-757

Dont handle up and down

Change-Id: I2b073aa2aef2fa671071257521b906dd6fddfb3c
Merge "base: fixed offscreen volume key handling" into android-4.4
merge changes from Omni 4.4 into local branch
[1/4] Base: Smart Phone Call

Put on your ear, and this will automatically call current number in message or dialer

Change-Id: I6ba4aa07e94121b3618200e7f43fefc8d116aca1

Conflicts:
	core/java/android/provider/Settings.java
[1/2] Base: On-The-Go mode

On-The-Go turns on the camera of your phone and streams it to an overlay,
which is drawn over everything.
this makes you feel like your display is transparent, as you see the content
behind it.

its really useful when you are using your phone while walking, thats why
we called it "On-The-Go"

allows to change transparency of the overlay via the notification.

have fun!

Change-Id: I149e3578e51d9b8b8c8bff41c4eaebca774739ab

Conflicts:
	packages/SystemUI/res/values/custom_strings.xml
	policy/src/com/android/internal/policy/impl/GlobalActions.java