[settings] long press back to kill configurable timeout (2/2)

1 - 2 seconds (default)
2 - 1,5 seconds
3 - 1 second
4 - 0,5 second

Forward ported from crDroid kk
Privacy icons: correct size and colors to match lollipop
Profiles: point to the right icon and add a generic one following lollipop color