Minor modifications

src/main/java/bitsplease/mummymayhem/GameLoop.java

src/main/java/bitsplease/mummymayhem/GameViewController.java

src/main/java/bitsplease/mummymayhem/MainWindow.java

...main/java/bitsplease/mummymayhem/MapEditorController.java

src/main/java/bitsplease/mummymayhem/model/GameModel.java

src/main/java/bitsplease/mummymayhem/model/Player.java

...in/java/bitsplease/mummymayhem/model/buildings/Tower.java

...ava/bitsplease/mummymayhem/model/buildings/TowerType.java

src/main/java/bitsplease/mummymayhem/model/map/Field.java

src/main/java/bitsplease/mummymayhem/model/map/Map.java

...e/mummymayhem/model/persistence/CustomMapPersistence.java

...n/java/bitsplease/mummymayhem/model/units/Demolisher.java

.../java/bitsplease/mummymayhem/model/units/DuneClimber.java

...main/java/bitsplease/mummymayhem/model/units/Fighter.java

src/main/java/bitsplease/mummymayhem/model/units/Runner.java

src/main/java/bitsplease/mummymayhem/model/units/Tank.java

src/main/java/bitsplease/mummymayhem/model/units/Unit.java

...a/bitsplease/mummymayhem/model/utils/DialogDisplayer.java

...ain/java/bitsplease/mummymayhem/model/utils/Renderer.java

src/main/java/bitsplease/mummymayhem/model/utils/Sprite.java