Add access for previous world.
Add class for Position operation.
Add method for get actual word.
Remove unneed, parametre in constructor.
Correct syntax error in return.
GameSystem, is class for move entity

* Recursive call for push movable entity.
* If move isn't possible moveEntity return false, else return true.
* Move just one case.
sauvegarde la résolution
fi x bug tri des sprites
effet de voile noir semi transparent pour le menu
merge animation
code clean
plus joli niveau de test