Option to use volume keys to control media volume anytime (1/2)

Some users don't adjust ringtone volume often (e.g. only use toggle to
switch between silent and non-silent) mode. Having an option to
use the volume keys to control media volume anytime allows media
volume to be controllled/muted before entering a game or other apps
with sound in an undesirable location.
Fix code alignment
add Launcher Settings

Change-Id: I384d10360ac21836601c95606355d1931b2a1d42
Pie: Add option to change pie's angle from the attach 1/2
Pie: set angle default to 12° (2/2)
Pie Angle: better values and strings
Pie trigger: fix double default