Fix double and tripple click of REntityServer

SpigotCore_Main/src/de/steamwar/entity/REntityServer.java

@@ -69,14 +69,22 @@ public class REntityServer implements Listener {
     private final HashMap<Player, Integer> viewDistance = new HashMap<>();
 
     private EntityActionListener callback = null;
+    private final Set<Player> playersThatClicked = new HashSet<>();
 
     private final BiFunction<Player, Object, Object> filter = (player, packet) -> {
         REntity entity = entityMap.get(useEntityTarget.get(packet));
         if (entity == null)
             return packet;
 
+        if (playersThatClicked.contains(player))
+            return null;
+
+        playersThatClicked.add(player);
         EntityAction action = getEntityAction.apply(useEntityAction.get(packet)) == 1 ? EntityAction.ATTACK : EntityAction.INTERACT;
-        Bukkit.getScheduler().runTask(Core.getInstance(), () -> callback.onAction(player, entity, action));
+        Bukkit.getScheduler().runTask(Core.getInstance(), () -> {
+            playersThatClicked.remove(player);
+            callback.onAction(player, entity, action);
+        });
         return null;
     };