Refixed last commit + OnLeave

- Order is now 4. Hook-order works by priority, so this will now allow
Nicks to properly work with TShockIRC.
- OnLeave shall no longer throw unhandled exceptions when Terraria
Server Listings attempt to connect.
- TShock.Utils.Broadcast -> TSPlayer.All.SendMessage at the OnChat hook
(didn't bother checking the whole plugin).