refactor: move all caches to RenderResources object

lightkeeper/include/Lightkeeper.h

@@ -3,6 +3,7 @@
 
 #include <destrum/App.h>
 #include <destrum/Scene/SceneManager.h>
+#include <destrum/Graphics/RenderResources.h>
 
 #include "destrum/Graphics/Resources/Cubemap.h"
 #include "destrum/ObjectModel/GameObject.h"
@@ -19,10 +20,6 @@ public:
 
     void onWindowResize(int newWidth, int newHeight) override;
 private:
-    MeshCache meshCache;
-    MaterialCache materialCache;
-    GameRenderer renderer;
-
     Camera camera{glm::vec3(0.f, 0.f, -5.f), glm::vec3(0, 1, 0)};
 
     MeshID sphereMesh;