tried to add assimp (spoilers, it did not go well, so hey! now we have separate fiels now.)

src/Common.h

@@ -0,0 +1,54 @@
+#pragma once
+
+#include <iostream>
+#include <algorithm>
+#include <stdexcept>
+#include <filesystem>
+#include <fstream>
+#include <sstream>
+#include <ctime>
+#include <chrono>
+#include <cmath>
+#include <cstdlib>
+#include <string>
+#include <vector>
+#include <memory>
+
+#include <glad/glad.h>
+#include "ThirdParty/imgui/imgui.h"
+#include "ThirdParty/imgui/imgui_internal.h"
+#include "ThirdParty/imgui/backends/imgui_impl_glfw.h"
+#include "ThirdParty/imgui/backends/imgui_impl_opengl3.h"
+#include "ThirdParty/ImGuizmo/ImGuizmo.h"
+#include "ThirdParty/glm/glm.hpp"
+#include "ThirdParty/glm/gtc/matrix_transform.hpp"
+#include "ThirdParty/glm/gtc/type_ptr.hpp"
+#include "ThirdParty/glm/gtc/quaternion.hpp"
+
+#ifdef _WIN32
+#include <windows.h>
+#include <shlobj.h>
+#endif
+
+namespace fs = std::filesystem;
+
+// Constants
+constexpr float SENSITIVITY = 0.1f;
+constexpr float CAMERA_SPEED = 2.5f;
+constexpr float FOV = 45.0f;
+constexpr float NEAR_PLANE = 0.1f;
+constexpr float FAR_PLANE = 100.0f;
+constexpr float PI = 3.14159265359f;
+
+// Forward declarations
+class Mesh;
+class OBJLoader;
+class Renderer;
+class Camera;
+class ViewportController;
+class Project;
+class ProjectManager;
+class Engine;
+
+// Global OBJ loader instance (extern declaration)
+extern OBJLoader g_objLoader;