Freeze the channel info in Main

[Coolio]

The main channel in the chat client has various bits of info in it but can be lost quite quickly in the chat (especially if enter/exit messages are turned on).

I suggest that the info should be frozen so that it remains at the top of the chat & doesn't fall off of the screen. Perhaps allow individual channel owners to activate the same function optionally.

Also we have a number of veteran users issuing standard text to help new players that are joining. It might be helpful to include some new player info in the General Channel info (how to access /help, guides, Quick Play, etc.)