Added /join and /part commands to the chat; you can join(and create) any...

Added /join and /part commands to the chat; you can join(and create) any channel you wish (name must be letters & - _ only)
Added a list of current channels to the options
Channels are now remembered and will reconnect when the game starts


git-svn-id: http://svn.net-core.org/repos/t-engine4@6386 51575b47-30f0-44d4-a5cc-537603b46e54