adding event meachinsm for game items that change and sound support.

game/state/events/explosion_event.hpp

@@ -0,0 +1,21 @@
+#pragma once
+
+#include "state/explosion.hpp"
+#include "state/state_update_event.hpp"
+
+namespace game {
+    class ExplosionEvent : public StateUpdateEvent {
+    public:
+        ExplosionEvent(StateUpdateEvent::LifeCycle lifeCycle, Explosion *explosion)
+            : StateUpdateEvent(lifeCycle, StateUpdateEvent::EventType::Explosion)
+            , explosion(explosion)
+
+        {
+            std::string typeStr = StateUpdateEvent::lifeCycleToString(lifeCycle);
+            std::cout<<"created explosion event for id " << explosion->id << " of type " << typeStr << std::endl;
+        }
+
+    public:
+        Explosion *explosion;
+    };
+}