Add ecs ComponentListener

- Add ecs ComponentListener which listens to Component addition and
  removal
- Add RefCounter class used to keep track of moves and copies

CopiumEngine/src/copium/core/Window.h

@@ -3,11 +3,17 @@
 #include "copium/util/Common.h"
 #include "copium/util/Enum.h"
 
-#include <GLFW/glfw3.h>
+#include <vulkan/vulkan.hpp>
+
+#define CP_WINDOW_MODE_ENUMS \
+        Fullscreen, \
+        BorderlessWindowed, \
+        Windowed
 
-#define CP_WINDOW_MODE_ENUMS Fullscreen, BorderlessWindowed, Windowed
 CP_ENUM_CREATOR(Copium, WindowMode, CP_WINDOW_MODE_ENUMS);
 
+struct GLFWwindow;
+
 namespace Copium
 {
   class Window final
@@ -24,6 +30,10 @@ namespace Copium
     Window(const std::string& windowName, int width, int height, WindowMode mode);
     ~Window();
 
+    bool ShouldClose() const;
+
+    int GetWidth() const;
+    int GetHeight() const;
     VkSurfaceKHR GetSurface() const;
     GLFWwindow* GetWindow();