NNUE to master branch, but disabled
NNUE to master branch, but disabled

This seems to work well enough, putting it to master -- but keeping
disabled for now until I can (at least) train a better network. Testing
shows this performs about on-par NNUE vs traditional; I think more
training data for a better network will help, alongside actually making
it incremental.

jwatzman/nameless-chessbot,jwatzman/nameless-chessbot