fixed a lot of stuff with camera and importing

src/ModelLoader.h

@@ -15,7 +15,7 @@ class ModelLoader
 public:
     static std::unordered_map<std::string, std::shared_ptr<Model>> models;
 
-    static std::shared_ptr<Model> load_from_file(std::string_view _path);
+    static std::shared_ptr<Model> load_from_file(std::string_view _path, bool zUp = false);
 };