Correct ome pookoo integration
Adapting kudu to new pookoo physics api
Beginning the SFML img_manager
Update the SFML engine
Finished SFMLImgManager
Finished SFMLSndManager
Correct bugs on loading screen
Finished Box2DPhysicsManager
Correct bugs with no music initialized on update_music_status
Set up new init API
Refactoring init engine into a single class Engine
Adding screen_diff_ratio to simulate the fact you are at 1080p, even with lower resolutions (TODO 4:3)
Implemented 4:3 screen ratio
Update physics for all worlds, not just the current one
Implemented flip image
Hide sides when resolution is different than 16:9