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/input/input.h

@@ -0,0 +1,97 @@
+#include <renderer.h>
+#include <math.h>
+#include <array>
+#include <GLFW/glfw3.h>
+
+enum class InputEvent
+{
+    KEY_PRESS,
+    KEY_RELEASE,
+    MOUSE_MOVE,
+    MOUSE_BUTTON_PRESS,
+    MOUSE_BUTTON_RELEASE,
+};
+
+enum class InputKey
+{
+    KEY_A,
+    KEY_B,
+    KEY_C,
+    KEY_D,
+    KEY_E,
+    KEY_F,
+    KEY_G,
+    KEY_H,
+    KEY_I,
+    KEY_J,
+    KEY_K,
+    KEY_L,
+    KEY_M,
+    KEY_N,
+    KEY_O,
+    KEY_P,
+    KEY_Q,
+    KEY_R,
+    KEY_S,
+    KEY_T,
+    KEY_U,
+    KEY_V,
+    KEY_W,
+    KEY_X,
+    KEY_Y,
+    KEY_Z,
+    KEY_0,
+    KEY_1,
+    KEY_2,
+    KEY_3,
+    KEY_4,
+    KEY_5,
+    KEY_6,
+    KEY_7,
+    KEY_8,
+    KEY_9,
+    KEY_UP,
+    KEY_DOWN,
+    KEY_LEFT,
+    KEY_RIGHT,
+    KEY_ENTER,
+    KEY_BACKSPACE,
+    KEY_TAB,
+    KEY_SHIFT,
+    KEY_CONTROL,
+    KEY_ALT,
+    KEY_CAPS_LOCK,
+    KEY_SPACE,
+    KEY_ESCAPE,
+    MOUSE_LEFT,
+    MOUSE_RIGHT,
+    MOUSE_MIDDLE,
+    MOUSE_BUTTON_4,
+    MOUSE_BUTTON_5,
+    MOUSE_BUTTON_6,
+    MOUSE_BUTTON_7,
+    MOUSE_BUTTON_8,
+};
+
+class InputManager
+{
+private:
+    GLFWwindow* window;
+    Vec2 scroll_delta;
+    Vec2 last_mouse_position;
+    std::array<bool, 400> previous_key_states;
+    std::array<bool, 8> previous_mouse_button_states;
+
+    int get_key_code(InputKey key);
+    int get_mouse_button_code(InputKey key);
+
+public:
+    InputManager(GLFWwindow* win);
+    bool is_pressed(InputKey key);
+    bool was_pressed(InputKey key);
+    bool was_released(InputKey key);
+    Vec2 get_mouse_position();
+    Vec2 get_mouse_delta();
+    Vec2 get_scroll_delta();
+    void update();
+};