volume adjust sound preference

Conflicts:
	res/values/velocity_strings.xml

Change-Id: I1795f4927cabcefb5d7eb0e376ee461b941e273b
kill app long press back
sound settings:
- allow volumes to be unlinked.
- make the volume overlay more functional
Change to velocity

Change-Id: I1489d63d1ff78c2f9747c3e888ddf88ea2d90c1a