Extend scoring rule to support number of captures and alive groups variants

[KvanTTT]

It's a follow-up of #1101

In standard vairant of AtariGo a player or opp wins when it captures at least one stone. However, I guess it can be extended to arbitrary number of stones.

In KillAllGame a defender wins when it builds two-eye alive shape, otherwise the attacker wins.

It's probably related to #543, #261

[lightvector]

Sounds like you want to look at https://github.com/hzyhhzy/KataGomo