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Chess engine: Walleye 1.5.0

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Walleye is a UCI-compatible engine written using the classical alpha-beta style AI. It supports loading board positions from arbitrary FEN strings, Unicode pretty printing to the console, and UCI communication logs to help with debugging.
Originally this project was meant as a first introduction to rust and chess programming, but it got a bit carried away.
Author: Mitchel Paulin

v.1.5.0
Move generation performance tuning
Switched to mimalloc memory allocator
Changed build profile to compile for the native CPU arch (https://github.com/MitchelPaulin/Walleye#portability)
Added null move pruning
Fixed bug where engine would never capture en passant


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