Settings: Battery bar (2/2)

* Patch inspired by MIUI and originally ported by David Morgan / @Spitemare
* as a extra feature for custom @CyanogenMod 7 ROMs.  Patch has been adapted
* to work better on @SaberMod.  Much of the work was done by Daniel Nilsson / @syaoran12
* Patch is nearly identical in nature to how Dan has writen it, with a few
* minor changes in removing the option to have centered bar, which doesn't
* seem to work very well on some devices like the Nexus 7 (grouper).  Also
* does not check for devices with no navigation bar as @SaberMod only supports
* nexus devices that all have navigation bars.

Signed-off-by: Paul Beeler <sparksco@gmail.com>