Migrate FightSystem modes and countdowns to GameCore

- Move shared arena-mode abstractions into GameCore
- Adapt fight countdowns and APIs to the shared model
- Add SteamWar issue audit workflow and SQL language settings

TowerRun/src/de/steamwar/towerrun/state/GameState.java

@@ -19,41 +19,30 @@
 
 package de.steamwar.towerrun.state;
 
-import lombok.Getter;
+import de.steamwar.gamecore.state.GameStateMachine;
 import lombok.experimental.UtilityClass;
 
-import java.util.ArrayList;
-import java.util.List;
-
 @UtilityClass
 public class GameState {
-    @Getter
-    private static GameStates currentState = GameStates.WAITING;
-    private static final List<GameStateListener> gameStateListeners = new ArrayList<>();
+    private static final GameStateMachine<GameStates> state = new GameStateMachine<>(GameStates.WAITING);
 
-    public static void addGameStateListener(GameStateListener gameStateListener) {
-        gameStateListeners.add(gameStateListener);
+    public static GameStateMachine<GameStates> getLifecycle() {
+        return state;
+    }
+
+    public static GameStates getCurrentState() {
+        return state.getCurrentState();
     }
 
     public static void nextState() {
-        final GameStates oldState = currentState;
-        currentState = currentState.getNextState();
-        gameStateChanges(oldState, currentState);
+        state.transitionTo(state.getCurrentState().getNextState());
     }
 
     static void setState(final GameStates newState) {
-        final GameStates oldState = currentState;
-        currentState = newState;
-        gameStateChanges(oldState, currentState);
+        state.transitionTo(newState);
     }
 
     public static void reset() {
-        final GameStates oldState = currentState;
-        currentState = GameStates.WAITING;
-        gameStateChanges(oldState, currentState);
-    }
-
-    private static void gameStateChanges(GameStates oldState, GameStates newState) {
-        gameStateListeners.forEach(gameStateListener -> gameStateListener.onGameStateChange(oldState, newState));
+        state.transitionTo(GameStates.WAITING);
     }
 }