SystemUI: add customizable navigation bar

Change-Id: Ibad1ecf52c7db0ac352892aed7529de68476c092
Signed-off-by: Roman Birg <romanbirg@gmail.com>
SystemUI: Fix NavBar FC

Change-Id: I5cfa3110e0239023801c5233164c6cafae5f8498
SystemUI: fix alt back icon; navbar button fc

Change-Id: I61cb2a3d5ad024922016a1ff03564bc114bd0f0b
Signed-off-by: Roman Birg <romanbirg@gmail.com>
Fix build

Signed-off-by: iceandfire <arhamjamal@gmail.com>