feat: add 2D rendering pipeline

lightkeeper/include/Lightkeeper.h

@@ -34,6 +34,8 @@ private:
     MeshID sphereMesh;
     MaterialID sphereMaterial;
 
+    ImageID texID;
+
     std::unique_ptr<CubeMap> skyboxCubemap;
 
     GameObject* capybara = nullptr;
@@ -42,6 +44,8 @@ private:
     char newSceneName[128]{"EmptyScene"};
     std::string sceneStatus;
     bool renderBoxColliders{false};
+    bool renderQuads{true};
+    bool renderDebugLines{true};
 };
 
 #endif //LIGHTKEEPER_H