Support Common CTCP Commands

[CircleCode]

see http://en.wikipedia.org/wiki/Client-to-client_protocol for a short list, and http://www.irchelp.org/irchelp/rfc/ctcpspec.html for reference.

Extended support could include:

• [ ] FINGER - Returns the user's full name, and idle time.
• [ ] VERSION - The version and type of the client.
• [ ] SOURCE - Where to obtain a copy of a client.
• [ ] USERINFO - A string set by the user (never the client coder)
• [ ] CLIENTINFO - Dynamic master index of what a client knows.
• [ ] ERRMSG - Used when an error needs to be replied with.
• [ ] PING - Used to measure the delay of the IRC network between clients.
• [ ] TIME - Gets the local date and time from other clients.