Chess engine: Mayhem 6.2 and NNUE

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Mayhem - UCI chess engine, Author: Toni Helminen
Rating CEDR=2971 (31 place)

v.6.2
Some updates
Support for 32 -> 64 pieces
Null move pruning back to where it was. In v6.1 it was bad in EG
Small fixes / +5 Elo

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