Colorize nicks on IRC.

I find it easier to follow a conversation if nicks are in different colors, so I added nick coloration.

This is a simple implementation whose color persists through restart, based on a hash function.
One could also write something more complicated to balance colors more evenly, but I don't think it's worse it.


PS: I modified my running script, then copy-pasted the edits to my machine that has git installed, so there might be a typo.