Added HelpMeShorty dynamic npc and quest (#7415)

* Short quest to allow the player to summon, via an item, a dynamic NPC that gives basic game information.
* After level 30, the player can get a costume in exchange for the item.

Co-authored-by: Aleos <aleos89@users.noreply.github.com>

src/map/script.cpp

@@ -25230,7 +25230,7 @@ BUILDIN_FUNC(duplicate_dynamic){
 
 	if( dnd == nullptr ){
 		script_pushstrcopy( st, "" );
-		return SCRIPT_CMD_FAILURE;
+		return SCRIPT_CMD_SUCCESS;
 	}else{
 		script_pushstrcopy( st, dnd->exname );
 		return SCRIPT_CMD_SUCCESS;