Merge branch 'warning-cleanup' into 'main'

...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/Player.java

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

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

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

...tsplease/mummymayhem/model/persistence/CustomMapSave.java

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

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

...in/java/bitsplease/mummymayhem/model/utils/Direction.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

...a/bitsplease/mummymayhem/model/buildings/BarrackTest.java

...va/bitsplease/mummymayhem/model/buildings/CastleTest.java

...test/java/bitsplease/mummymayhem/model/map/FieldTest.java