Settings: Quick Settings customization (Part 1 of 2) WIP!

This commit will alow configuring the Quick Settings tiles layout
in Settings.

Patchset 2 - Add QS Configuration UI (Danesh M)
Patchset 3 - Bug fixes
Patchset 4 - Cleanup
           - Sort supported tiles alphabetically
           - Add license headers
Patchset 5 - Fix re-arrangement bug
Patchset 6 - Add 'Static tiles' category and move Sound modes preference
Patchset 7 - Add Note to Power widget explaining interaction with Quick
             Settings panel behaviour
Patchset 8 - Whitespace derp
Patchset 9 - Restore Settings tile to AOSP location

Change-Id: I6239abb1b93f9d65072d16cc61954bb0140d4777