function toggleShuffle() {
    /*
      If shuffle is on, we toggle it off. If shuffle is off, we
      toggle on.
    */
    if (_config2.default.shuffle_on) {
      _config2.default.shuffle_on = false;
      _config2.default.shuffle_list = [];
    } else {
      _config2.default.shuffle_on = true;
      shuffleSongs();
    }
  }
Toggles the shuffle status globally.

@access public