boot: fix governor specific settings won't save

 * Save governor specific settings with full path as well
   as the desired value

 * Let the bootService read out all parameters for a given
   governor and add the values for each parameter to the
   array list.

 * Also change the set-on-boot order for cpu governors. We
   need to set the cpu governor before we execute the array
   list since we need to give the kernel some time to update
   the dictionaries, otherwise we would have a nullpointer.

Signed-off-by: Blechd0se <alex.christ@hotmail.de>
main: fix strange behaviour with BackStack

If back button is pressed twice the application will
exit. Navigation should now be happening only via
the navigation drawer. Only Exception is the settings
panel which is now a preference activity.

Since we have by design no "100-steps-deep-settings-things"
this is actually a good approach.

Signed-off-by: Blechd0se <alex.christ@hotmail.de>
pref: rework settings screen

 * Also rework the action bar a bit to be more
   intuitiv and remove the about panel from the
   action bar.

 * Add a few more "Google"-Icons which fit pretty
   well.

Signed-off-by: Blechd0se <alex.christ@hotmail.de>
Version 0.9.7

Signed-off-by: Blechd0se <alex.christ@hotmail.de>