Refactor renderer and input handling; add OBJ loader and math utilities

- Updated renderer.h to replace Vec3 and Vec2 structs with Math namespace equivalents.
- Introduced Texture struct to manage texture properties.
- Modified Triangle struct to use Texture instead of GLuint for texture handling.
- Removed deprecated matrix functions and replaced them with Math namespace methods.
- Implemented InputManager class for better input handling, including key and mouse state tracking.
- Added ObjLoader class to load OBJ files and associated textures, with MTL file parsing.
- Created math utilities for fixed-point arithmetic and vector/matrix operations.
- Added time management class for frame timing and delta time calculations.

Engine/time/time_manager.h

@@ -0,0 +1,32 @@
+#ifndef TIME_H
+#define TIME_H
+
+#include <cstdint>
+
+class Time {
+public:
+    Time();
+    
+    // Update time and calculate delta time (call each frame)
+    void Update();
+    
+    // Get delta time in seconds (fixed-point representation)
+    int32_t GetDeltaTime() const;
+    
+    // Get total elapsed time in seconds
+    float GetElapsedTime() const;
+
+private:
+    // Fixed-point scale for PS1-style precision
+    static constexpr int32_t FIXED_POINT_SCALE = 4096; // 12-bit fractional part
+    
+    double lastFrameTime;      // Last frame timestamp (in seconds, GLFW time)
+    double currentFrameTime;   // Current frame timestamp
+    int32_t deltaTime;         // Delta time in fixed-point
+    float elapsedTime;         // Total elapsed time in seconds
+    
+    // Convert float seconds to fixed-point
+    int32_t SecondsToFixed(float seconds) const;
+};
+
+#endif // TIME_H