Chess engine: Cosette 4.0 (Komekko)

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Cosette - UCI chess engine (written in C# for .NET Core platform) Rating JCER=2297
Author: Paweł Tearth

v. 4.0:
Added Texel project
Added check extension
Added check detection in quiescence search
Added evasion moves generator
Added static null-move pruning
Added futility pruning
Added new formulas calculating reduction for LMR and null move pruning
Added a new way of building Piece-Square tables, better for tuning
Fixed redundant saving of transposition table entries
Adjusted search parameters
Adjusted evaluation parameters
Improved threefold repetition detection
Updated .NET runtime version to 5.0.102



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