Add Komi Feature

[artasparks]

Right now, we train the AI to play with one Komi setting (usually 7.5 or 6.5). Then, the AI must play with that Komi forever or it'll get confused about the score. That's a bit too bad because it means that even if the AI gets/gives a handicap, Komi still needs to be set at 7.5 for white.

I don't see this as a huge problem, but I think it's worth tracking this feature. It also might be fun to play around with this on a 9x9-trained AI.

[amj]

here's a paper on the problem. https://arxiv.org/abs/1705.10701

[amj]

and here's another one. https://arxiv.org/abs/1809.03928