Expose VoiceBroadcast#dispatcher so that the broadcast can be controlled

src/client/voice/VoiceBroadcast.js

@@ -28,6 +28,14 @@ class VoiceBroadcast extends EventEmitter {
     this.player = new BroadcastAudioPlayer(this);
   }
 
+  /**
+   * The current master dispatcher, if any. This dispatcher controls all that is played by subscribed dispatchers.
+   * @type {?BroadcastDispatcher}
+   */
+  get dispatcher() {
+    return this.player.dispatcher;
+  }
+
   /**
    * Plays the given file in the voice connection.
    * @param {string} file The absolute path to the file