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New version chess engine: Ice4 v3.1

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Ice4 - UCI chess engine
by Minus Kelvin (Germany)

v.3.1:
This is the version of ice4 that will play in the TCEC Season 25 Swiss event on June 18, 2023, and is approximately 15 elo stronger than v3.
For more information, see https://wiki.chessdom.org/TCEC_4k_Rules.
ice4-ob (x86-64 only) supports FEN positions and configuring hash size and thread count.
ice4.exe is a Windows build identical to ice4-ob.
ice4 is configured with 1 thread and 8MB hash.
ice4-tcec is configured with 101 threads and 96 GiB hash.

github:https://github.com/MinusKelvin/ice4/releases/tag/v3.1

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