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Chess engine: Caissa 0.4 NNUE

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Caissa - UCI chess engine,  Author: Michał Witanowski

UCI command-line chess engine written in C++. Currently compiles only for Windows, Linux version is on the way.
Estimated ELO: 2800 (10+1 time control, single threaded, with NNUE)

v.0.4:
Fixed bug in Null Move Prunning
Added singularity search for root node
Introduced separate binaries for instruction sets:
x64 BMI2 - for modern CPUs supporting BMI2 and AVX2
x64 POPCNT - for older CPUs supporting SSE4 and POPCNT
x64 - for older legacy CPUs supporting only SSE2



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