Add Event system

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

CopiumEngine/src/copium/event/MouseScrollEvent.h

@@ -0,0 +1,18 @@
+#pragma once
+
+#include "copium/event/Event.h"
+
+namespace Copium
+{
+  class MouseScrollEvent : public Event
+  {
+  private:
+    int scrollX;
+    int scrollY;
+  public:
+    MouseScrollEvent(int scrollX, int scrollY);
+
+    int GetScrollX() const;
+    int GetScrollY() const;
+  };
+}