Chess engine: z5 v.2.1 and NNUE

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z5 - C++ UCI chess engine  and NNUE
Currently ~3150 elo (tested against amoeba 3.4).

v.2.1:
v1 is supported on all x86-64 CPUs
v2 has POPCNT, SSE3
v3 has AVX2, BMI, LZCNT (recommended)
v4 has AVX512
If you're on Linux, either build from source or open an issue or message me on Discord (zzzzz151), and I'll add Linux binaries!

Changelog
Small fixes


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