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Chess engine: Clovis II

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Clovis - UCI chess engine.

Named after the first king of the Franks and the paleoamerican mammoth slayers, Clovis is a powerful UCI chess engine written in C++. It is a successor to [Hopper Chess](https://github.com/jonathanmcdermid/Hopper-Chess-Engine) in that it follows standard convention more closely. 

v.II:
Clovis II joins the fray!
implemented move count pruning
use different thresholds for SEE based on whether or not quiets are skipped
virtual king mobility heuristic
queen promotions generated in capture stage
precalculate more masks and tables
more use of constexpr
Expecting a 50-70 Elo improvement from Clovis I

Clovis II download

github:https://github.com/jonathanmcdermid/Clovis/releases/tag/II

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