Add camera position and rotation setters

Introduces SetPosition and SetRotation methods to the Camera class, allowing direct control of camera position and orientation. Updates App to use these methods when switching scenes, and adjusts scene initialization logic and scene names. Also refactors Camera.h to expose position, pitch, yaw, and mouseCaptured as public members.

Update horse model and improve rendering shaders

Replaced the old horse model files with new Horse.gltf and Horse.bin, updated references in App.cpp, and adjusted model transforms. Improved CombinedImage, DefferedLightingPass, SSGI, and SSR fragment shaders for better lighting, AO, and reflection handling. SSGI now uses full resolution for GI image. Also renamed horse texture files for consistency.