Base: On-The-Go: Several fixes

handle camera in surfacetexture
check if notification manager is null before canceling
restart timeout when changing the camera mode
convert settings observer to a local variable
remove redundant try-catch clauses

Change-Id: If637e30f69706dc8b3f1397fafacb24c7bbb5083
Base: On-The-Go: Overlay status- and navigation bar as well

Change-Id: I067981028340cdd53fe112cae9b7a4ddcb7532a8
Base: On-The-Go: Change the way of changing the camera mode

changing it on the fly is too buggy like i have done it.
sometimes things fail and we are getting stuck ;P

on mode change, save the value, create a notification and stop the service.
the notification allows to restart the service.

Change-Id: Ie02f01a4ab2f856cd58fe5fde8c49220bf7efd4b

Conflicts:
	packages/SystemUI/src/com/android/systemui/nameless/onthego/OnTheGoService.java
Base: screenrecord: add a timer to notification

just to know how long we are already recording

Change-Id: I0851344670ef2e55c044c255daf907d6e72614e0