Ability to hide Volume State toggles in Power Menu (RC Part)

With the numerous ways you can change Volume States
(tiles, toggles, NavBar, NavRing, lockscreen), some
may want to be able to hide the toggles that are in
the Power Menu if they aren't using them.

This also contains the string edits I've made in my other
commit.

Patch Set 2: White Space and Formatting Fixes

Patch Set 3: Hopefully I got the formatting down this time...

Patch Set 4: Formatting
Change-Id: Ie7af1545435ff601d7f6acd022c2266365a54eea