Added: Privmsg command "message" and Bukkit command /ircmessage

IRC users can now use a privmsg command: "message." It will send a private message to any player in Minecraft. Minecraft players have their version: /ircmessage. /ircmessage will not send to users not in a channel with a bot, so no worries on bothering other users on IRC networks.

Also added royalirc.* node. Changed messages.itbPrivmsg to messages.itbMessage, changes should be made accordingly.

As usual, these changes have been barely tested. Use at your own risk.