UnoBot needs a license

[dgw]

While based on code released under the BSD two-clause license, this project doesn't actually define a license for the copious modifications. I realized this while reading the README and thinking about what features have been added since it was last updated…

My immediate instinct is to go GPL (with which the original license is compatible), but I'd like to think on it. Actually, uncertainty as to which license to use is probably why old me just slapped a disclaimer on it and did nothing further, but that's not responsible open-source behavior. (It's slightly excusable for code I wrote entirely from scratch, but certainly not for derivative works!)

Anyway, this issue is to show that, yes, licensing is on my radar. Not on the front burner, so to speak, but I do want to make a decision soon-ish.