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Chess engine: Frozenight 2.1.0 NNUE (Windows and Linux)

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Frozenight - NNUE chess engine written in Rust. 

v.2.1.0:
This release fixes a bug where Frozenight would repeat moves in winning positions. It also updates Frozenight's search algorithm to Principal Variation Search, which should help with Frozenight's relatively poor performance at longer time controls. Overall, this release is estimated to be about 50 elo stronger than version 2.0.0 at long time controls.

The release binaries are categorized by microarchitecture levels. The general rule of thumb is:
x86-64-v3 will work on modern (2015+) CPUs (avx2, bmi1, lzcnt, etc.)
x86-64-v2 will work on older (2009+) CPUs (popcnt, sse4, etc.)
x86-64 will work on any x86_64 CPU.

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