White scroll & PiratePQ fix + Party for starters + concurrency protection on event scripts

Fixed successful scrolled items not using up an upgrade slot when using white scroll. Fixed some issues with the PiratePQ and added a "clear all boxes to complete a stage"-mode. Added "Party for Starters" feature. Added concurrency protection on event script modules.

src/net/server/world/MapleParty.java

@@ -21,6 +21,7 @@
 */
 package net.server.world;
 
+import client.MapleClient;
 import java.util.Collection;
 import java.util.Collections;
 import java.util.LinkedList;
@@ -195,6 +196,24 @@ public class MapleParty {
         return slot;
     }
     
+    public void assignNewLeader(MapleClient c) {
+        World world = c.getWorldServer();
+        MaplePartyCharacter newLeadr = null;
+        
+        lock.lock();
+        try {
+            for(MaplePartyCharacter mpc : members) {
+                if(mpc.getId() != leaderId && (newLeadr == null || newLeadr.getLevel() < mpc.getLevel())) {
+                    newLeadr = mpc;
+                }
+            }
+        } finally {
+            lock.unlock();
+        }
+
+        if(newLeadr != null) world.updateParty(this.getId(), PartyOperation.CHANGE_LEADER, newLeadr);
+    }
+    
     @Override
     public int hashCode() {
         final int prime = 31;