Chess engine: Belette 3.0.0

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Belette - UCI-compatible chess engine written in C++. 
Author - Vincentbab

For now it only supports CPUs with AVX2 and BMI2 instructions. Support for other architectures might be added in the future.

v.3.0.0:
Changes
UCI Threads option
Null move pruning (NMP)
Reverse futility pruning (RFP)
Internal iterative reduction (IIR)
Late move reduction (LMR)
Late move pruning (LMP)
SEE pruning in main search
Butterfly history heuristic


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