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.

.vscode/c_cpp_properties.json

@@ -5,6 +5,9 @@
             "includePath": [
                 "${workspaceFolder}/Engine/renderer",
                 "${workspaceFolder}/Engine/loader",
+                "${workspaceFolder}/Engine/math",
+                "${workspaceFolder}/Engine/input",
+                "${workspaceFolder}/Engine/time",
                 "${workspaceFolder}/Engine",
                 "${workspaceFolder}/external/**",
                 "/usr/include",