Chess engine: Astra 4.01 and NNUE

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Astra is a UCI chess engine written in C++.
Author: Semih Özalp

Evaluation
- NNUE (Efficiently Updatable Neural Network)
- Currently trained on ~38 mil. positions
- [Pytorch Neural Network](https://github.com/h1me01/Pytorch-Neural-Network)

## Credits
- [Stockfish](https://github.com/official-stockfish/Stockfish)
- [Koivisto](https://github.com/Luecx/Koivisto)
- [Smallbrain](https://github.com/Disservin/Smallbrain)
- [Chess Programming Wiki](https://www.chessprogramming.org/Main_Page)

v.4.01:
This update mainly adds AVX512 support and fixes a few minor issues with the transposition table.

Although the version remains 4.0 since there aren't major changes, I would still recommend using this version as the improved transposition table likely makes it stronger, even if only slightly.


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