new chat commands

here is a list of commands that will work in the chatbox

commands:

/brb | usage: /brb reason | example: outlaw1994 will be right back. dinner
/back | usage: /back | example: outlaw1994 is back
/help | usage: /help why | example: outlaw1994 needs help with a deck
/duel | usage: /duel username | example: outlaw1994 wants to duel nameless