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Chess engine: Catto 0.12.1

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Catto - UCI chess engine
Author: Phu Minh  Rating CEDR=2316
New versions of the Catto engine are released every few moments, so there is no time for thorough testing. Maybe the author should reduce the frequency of releasing new builds to fine-tune them?

 What do we currently have?
The engine
Negamax search algorithm with Alpha-Beta pruning.
Move ordering:
MVV-LVA heuristic.
Killer heuristic.
History heuristic.
Countermove heuristic.
Checkmate and stalemate detection.
Quiescence search.
Evalution:
PeSTO evaluation.
Pawn structure.
UCI.

v.0.12.1:
Minor hash optimization.


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