Stock mode [1/2]

deactivate custom ROM features for those who like simple AOSP
but want to benefit from the back end && performance enhancements
of a custom ROM.

to do: add checkbox preference for resetting navbar/navring
       and quicksettings strings and setting various other
       features back to their default state.

-VanirAOSP

PS2: reflect changes in reboot dialog since recovery has
     potential negative implications

Change-Id: I0180f0228566163bc2fdac291ebfcfa88c78907b
base: Remove duplicated key handling

Change-Id: Ifd8ecac2b3758f0c6a4dbaa39350831af0b145a0
Signed-off-by: Jorge Ruesga <jorge@ruesga.com>