Added logic for mastervolume. And a coresponding event.

(sources need to be updated for it to be fully working)

include/Sound/EMasterVolume.h

@@ -0,0 +1,27 @@
+//
+// Created by Adam on 2015-09-24.
+//
+
+#ifndef EVENTS_EMASTERVOLUME_H__
+#define EVENTS_EMASTERVOLUME_H__
+
+#include "Core/EventBroker.h"
+
+namespace dd
+{
+
+namespace Events
+{
+
+struct MasterVolume : public Event
+{
+    float gain = 1;
+    //To determine what channel group to apply the change to.
+    bool isAmbient = false;
+};
+
+}
+
+}
+
+#endif