Chess engine: Mayhem 4.5 and NNUE (Windows and Linux)

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Mayhem - UCI chess engine, Author: Toni Helminen
Rating JCER=2550

v.4.5
Slightly faster and stronger Mayhem
VLA removed
Speedups here and there
Some fixes and corrections
Net: nn-cb80fb9393af.nnue
Book: performance.bin

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