Add Event system

- Add abstract Event class
- Add EventDispatcher
- Add Mouse, Key and Window Events

CopiumEngine/src/copium/event/MousePressEvent.h

@@ -0,0 +1,18 @@
+#pragma once
+
+#include "copium/event/Event.h"
+
+#include <glm/glm.hpp>
+
+namespace Copium
+{
+  class MousePressEvent : public Event
+  {
+  private:
+    int button;
+  public:
+    MousePressEvent(int button);
+
+    int GetButton() const;
+  };
+}