DELETE Session, UPDATE Game
The class Session was erased after its code was displaced to Game.
We added some methods to Game to shorten the code of the method play.
UPDATED Game, Player
Added the method choice to Player and changed the method turn so that it
uses it to determinate the actions taken by the player
NEW CLASS Contexte, UPDATES Game, Player
Begin to transmit data to the simulator of choice about the choice it
makes