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Chess engine: Cosette 2.0

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Cosette - UCI chess engine (written in C# for .NET Core platform)
Author: Paweł Tearth


2.0:
-Added fifty-move rule detection
-Added new evaluation functions: pawn shield, bishop pair, doubled rooks, a rook on open file
-Added "evaluate" command to get FEN position evaluation
-Added ability to postpone moves generation before PV move check
-Added evaluation hash table
-Added Arbiter app to speed up the process of testing engine
-Added support for UCI's winc and binc
-Fixed PV node detection
-Fixed invalid detection of passing pawns
-Fixed invalid best move when a search has been aborted
-Fixed static exchange evaluation - in rare cases the table was returning an invalid score
-Improved method of probing piece type at the specified field
-Improved time management - now allocated time depends on the moves count
-Improved move ordering: castling and better promotions are now prioritized
-Improved transposition tables: entries are now smaller, have proper checkmate scores (relative to position) and are used between moves (aging)
-Redefined and reduced the size of Move structure (from 4 bytes to 2 bytes)
-Reduced size of transposition table entry (from 16 bytes to 12 bytes), evaluation hash table entry (from 8 bytes to 4 bytes) and pawn hash table entry (from 8 bytes to 4 bytes)
-Optimized printing UCI output
-Adjusted move ordering scores
-Updated .NET Core runtime version to 3.1.403




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