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.