[2/2] Settings: Volume panel timeout

Base: https://gerrit.omnirom.org/#/c/5516/

PS6
move it up below volume panel style preference

PS7
added volume panel category

Change-Id: Ic5c09e70ff08ad030119a8b169b885a8053e3a6f
Merge "[2/2] Settings: Volume panel timeout" into android-4.4
merge changes from Omni 4.4 into local branch

Conflicts:
	res/values/custom_strings.xml

Change-Id: If698417da2eab2d49f3b9770a7fec0c52ac5e917
Ouch!

Change-Id: I266065b29c777029b742e0e2fa608438296a27ea