Performance: fixed memory leaks on each card viewer or draft open (10 Mb per call, related to #11285, fixes #9548)

Mage/src/main/java/mage/game/events/EventSource.java

@@ -1,17 +1,17 @@
-
-
 package mage.game.events;
 
 import java.io.Serializable;
 
 /**
- *
+ * TODO: there are duplicated interfaces of EventSource, must combine in single
  * @author BetaSteward_at_googlemail.com
  * @param <E>
  */
 public interface EventSource<E extends ExternalEvent> extends Serializable {
 
     void addListener(Listener<E> listener);
+
+    void removeListener(Listener<E> listener);
     
-    void removeAllListener();
+    void removeAllListeners();
 }