Fix and clean code

...in/java/bitsplease/mummymayhem/BuildDialogController.java

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

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

...ain/java/bitsplease/mummymayhem/MainWindowController.java

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

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

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

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

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

...java/bitsplease/mummymayhem/model/utils/ImageStorage.java

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

...va/bitsplease/mummymayhem/model/utils/ResourceLoader.java

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

src/main/resources/bitsplease/mummymayhem/mmstyle.css

...test/java/bitsplease/mummymayhem/model/GameModelTest.java

src/test/java/bitsplease/mummymayhem/model/PlayerTest.java

...va/bitsplease/mummymayhem/model/utils/PathFinderTest.java