add trade channel to irc

[tiggy26668]

so aside from not seeing the /fails that type in trade when they mean to be typing in global and missing half of a conversation....

it would b nice to see things that are being bought and sold in case you're on irc and wanna buy or sell something. then you could just hop in game do ur business and go back to being an irc lurker. it would save the trouble of having to have mc open all the time just to see the trade channel, which kinda defeats the purpose of having an outside chat.