Add Intermud chat functionality (IMC 3 a.ka. I3 in this case)

[jnharton]

I'd like to add this kind of functionality. Since this exists already I'd like to use an existing set of code.

There is some I3 code from a mud that was in development ca. 2005 called Aelfengard that is GPL licensed and is available for download at MUDBytes.net

[link]

DEPENDENCY: a working internal/local chat system