Chess engine: Astra 3.4 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.3.4:
Changes:
bug fixes
new net architecture (768->2x512->1 instead of 768->2x256->1)


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