Quicksettings: Sound tile

Dual Ringer & Volume tile.

* Click on front goes to next ringer mode (silent, vibration, sound).
* Click on back goes to volume change.
* Long click goes to sound settings.
* Handles Vibrate when ringing.

Screencast: http://www.youtube.com/watch?v=gqlPhRBruSU

Based on commit: https://gerrit.paranoidandroid.co/#/c/522/ by cristianomatos.

PS2: Removed tabs.

Change-Id: Ida4b0f05e8a886b5249d758f1efb36bb364275cf

Conflicts:
	packages/SystemUI/res/values/pa_strings.xml