As suggested by Joshua, this commit adds the 2-clause BSD license as a
comment block to the top of every source file.
For the first pass, I've just added myself for simplicity. I encourage
everyone to add themselves as copyright holders of any file they've
added or modified in some significant way. If I've added myself in
error somewhere, feel free to replace it with the appropriate copyright
holder instead.
Going forward, all new source files should include a license header.
IRCChannel and IRCQuery objects now create their own windows with the
help of an aid_create_window callback provided by IRCAppWindow.
There's still a bit of murk but this is already an improvement.
