Removed useless popup + 3rd job Cygnus revamp + droplimit command

Removed the Stat Upgrade UI that would popup when leveling up to 15/20/25/30.
Improved 3rd job advancement for Cygnus Knights, now working GMS-like.
Added "droplimit" command. When issued, it will show to the player the current drop count on the map.

src/server/maps/MapleMap.java

@@ -704,6 +704,10 @@ public class MapleMap {
         }
     }
     
+    public int getDroppedItemCount() {
+        return droppedItemCount.get();
+    }
+    
     private void instantiateItemDrop(MapleMapItem mdrop) {
         if(droppedItemCount.get() >= ServerConstants.ITEM_LIMIT_ON_MAP) {
             MapleMapObject mapobj;