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Chess engine: Astra 5.0

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


## 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.5.0:
NNUE Architecture
Previously 2x(768→1024)→1; now features a king bucket of size 10, resulting in a new arch: 2x(10x768→1024)→1
Evaluation
Besides the new network I added phase evaluation as well
Search
Improved time management within the search
Various other minor improvements
Miscellaneous
More efficient transposition table implementation
Added cuckoo tables to detect upcoming repetitions
Results vs. Astra 4.1
Astra-5 vs Astra-4.1 (STC)
Elo: 186.0 ± 7.3 (95%)
SPRT: 8.0+0.08s Threads=1 Hash=16MB
GAMES: N: 5474 W: 2984 L: 305 D: 2185


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