delete of unused classes

src/main/java/model/ClassicFireFighter.java

src/main/java/model/FireBehavior.java

src/main/java/model/FireManager.java

src/main/java/model/FireProperties.java

src/main/java/model/FirefighterBehavior.java

src/main/java/model/FirefighterManager.java

src/main/java/model/FirefighterProperties.java

src/main/java/model/MotorizedFirefighter.java

src/main/java/util/MotorizedStrategy.java