Merge branch 'simple' into 'main'

.idea/jarRepositories.xml

.idea/misc.xml

.idea/vcs.xml

build.gradle

gradle/wrapper/gradle-wrapper.properties

settings.gradle

src/main/java/App.java

src/main/java/Grid.java

src/main/java/Model.java

src/main/java/app/SimulatorApplication.java

src/main/java/app/SimulatorMain.java

src/main/java/controller/Controller.java

src/main/java/controller/PersistentToggleGroup.java

src/main/java/model/Board.java

src/main/java/model/FirefighterBoard.java

src/main/java/model/ModelElement.java

src/main/java/module-info.java

src/main/java/util/Position.java

src/main/java/util/TargetStrategy.java

src/main/java/view/FirefighterGrid.java