Fixing ConcurrentModificationException

Signed-off-by: Lixfel <agga-games@gmx.de>

FightSystem_Main/src/de/steamwar/fightsystem/record/Recorder.java

@@ -24,7 +24,7 @@ import java.util.List;
 
 public abstract class Recorder {
 
-    private static List<Recorder> recorders = new ArrayList<>();
+    private static final List<Recorder> recorders = new ArrayList<>();
 
     public static void rBoolean(boolean b){
         recorders.forEach((recorder) -> recorder.writeBoolean(b));
@@ -63,7 +63,8 @@ public abstract class Recorder {
     }
 
     public static void closeAll(){
-        recorders.forEach(Recorder::close);
+        while(!recorders.isEmpty())
+            recorders.get(0).close();
     }
 
     protected Recorder(){