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.

CMakeLists.txt

@@ -11,13 +11,18 @@ set(CMAKE_CXX_STANDARD_REQUIRED True)
 include_directories(${CMAKE_SOURCE_DIR}/Engine)
 include_directories(${CMAKE_SOURCE_DIR}/Engine/renderer)
 include_directories(${CMAKE_SOURCE_DIR}/Engine/loader)
+include_directories(${CMAKE_SOURCE_DIR}/Engine/input)
+include_directories(${CMAKE_SOURCE_DIR}/Engine/math)
+include_directories(${CMAKE_SOURCE_DIR}/Engine/time)
 include_directories(${CMAKE_SOURCE_DIR}/examples)
 include_directories(${CMAKE_SOURCE_DIR}/external/stb)
 
 # Source files
 set(SOURCES
     ${CMAKE_SOURCE_DIR}/Engine/renderer/renderer.cpp
-    ${CMAKE_SOURCE_DIR}/Engine/loader/mesh.cpp
+    ${CMAKE_SOURCE_DIR}/Engine/loader/obj_loader.cpp
+    ${CMAKE_SOURCE_DIR}/Engine/input/input.cpp
+    ${CMAKE_SOURCE_DIR}/Engine/time/time_manager.cpp
     ${CMAKE_SOURCE_DIR}/examples/cube.cpp
 )