put all files in unix format
fix breaked movements when autorepeat
fix motion of caisses by the hero
remove drawing of the scene's rect
refactor OBJ to OBJECTIF
add objectifs handling
add: return to menu when game is done

    put menu and vue as members of MainWindow
    use demarrerJeu() and afficherMenu() instead of changerAffichage()
    add (commented) drawing of the plateau's border
    refactor partieTerminee() to tousObjectifsFinis()
    emit new signal partieTerminee() when done