PS Bot improvements

We've made some updates to improve the efficiency of the PS bots. As a result these may play subtly differently for all depth levels and variants.

In particular there should be a noticeable difference in the skill level for @PS-Greedy-Two-Move and @PST-Greedy-Tom in the following games:
- Go 9x9
- Go 13x13
- Monster Chess

Previously these bot were only playing to depth 1 for these games, but it will now play to depth 2!

You may also notice improvements for bot behaviour in the following games:
- Amazons
- Backgammon
- Nackgammon
- Hyper
- Dameo
- Entropy

Enjoy playing our bots: playstrategy.org/player/bots

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