DocumentsUI: File manager

Parts authored by: Yamil Ghazi <yghazi@gmail.com>
[1/3] Add a center frequency for bass boost
[1/2] Switch to last app
[1/2] Quick pulldown: center
[1/2] Smart pulldown
[1/2] Network traffic indicator

Hide when no activity authored by kecinzer <kecinzer@gmail.com>
[1/2] Volume panel timeout
[1/2] Low battery warning policy
[1/2] Recents clear all button Location
[1/2] Lockscreen notifications