add option to display navbar (1/2)

Change-Id: Id0b09d22bfec899cd706e65d73feb7d907c0c101
add battery bar (thanks to spitemare) (1/2)

Change-Id: I6a3f3028946829e4117a519c827bdd6d88912e1d
silence low battery sound & fix typo

Change-Id: I446f6c431494e26719a6260156a384d5ce112cb1
[PATCH 4/7] back icon doesnt scale when changing navbar height
disable bootanimation option