Fixing collision detection system

[Mru1726]

I have improved the collision detection system of the game to :

1. Uses SFML's getGlobalBounds() to check the actual sprite dimensions, including scaling and rotation.
2. No more "Magic Numbers" for Hitboxes: Automatically adjusts for sprite size, making hitboxes accurate.
3. Detects any overlap between sprites, even if they don’t align perfectly.
4. Single checkCollision() function used consistently instead of repeated hardcoded checks everywhere.