MotorFirefighter ajout des Box (fini pour Fire)

src/main/java/app/SimulatorApplication.java

src/main/java/controller/Controller.java

src/main/java/model/Board.java

src/main/java/model/Box.java

src/main/java/model/Fire.java

src/main/java/model/Firefighter.java

src/main/java/model/FirefighterBoard.java

src/main/java/model/ModelElement.java

src/main/java/model/Mountain.java

src/main/java/model/Road.java

src/main/java/model/Rockeries.java

src/main/java/view/FirefighterGrid.java

src/main/java/view/Grid.java

src/main/java/view/ViewElement.java

src/test/java/model/FirefighterBoardTest.java

src/test/java/view/FirefighterGridTest.java