using packages

src/main/java/model/Board.java

src/main/java/model/Extinguisher/Cloud.java

src/main/java/model/Extinguisher/Extinguisher.java

src/main/java/model/Extinguisher/FireFighter.java

src/main/java/model/Extinguisher/MotorizedFireFighter.java

src/main/java/model/Fire.java

src/main/java/model/FirefighterBoard.java

src/main/java/model/ModelElement.java

src/main/java/model/Obstacle/Montain.java

src/main/java/model/Obstacle/Obstacle.java

src/main/java/model/Obstacle/Road.java

src/main/java/model/Obstacle/Rocaille.java