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Aspen 2.0.0 - new version chess engine

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Aspen is a UCI chess engine written in C++ that evaluates positions using a custom NNUE.
Author: ATheofanis

Aspen 2.0.0 what's new?
This is a major release as the NNUE has finally been updated, just 2 weeks after the first NNUE was released. The increase in Elo is noticeable, estimated to be over 100 Elo in comparison to version 1.3.0.

NNUE Improvements
New network trained from 562 million self-play positions from the previous version's NNUE
Doubled hidden layer size to 512
Search Improvements
To combat the slight NPS drop caused by the hidden layer size increase, the search has been slightly tuned for more aggressive pruning.

Late Move Pruning: LMP is now more aggressive with a lower threshold
Late Move Reductions: LMR was already improved in v1.3.0, but a slight tweak made it even more effective
Coming in future releases
NNUE upgrades (Horizontal Mirroring, Output Buckets)
A much-needed change to the move history scoring system
More search upgrades and of course cleaner code and comments


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