Quicksettings addons.

* Add lightbulb tile.
  Phone: Click to toggle flash on/off, long click to open the app.
  Tablet (No flash): Click to open the app with white screen and 100% of brightness.
  Added boolean to check if flash is available (default false, defined by overlay).
  Added camera permissions to SystemUI.
  Thanks Lo Huot for the drawables.
* Quick pull down from right side of status bar.
* Long click action for user tile (opens sync settings).
* Long click action for rotation tile (opens accessibility settings).
* General cleanup.

Change-Id: I84a90d64cae466b2461be4164ff89b17fa920b84
Signed-off-by: Carlo Savignano <stevewatersy@gmail.com>