Choose Your Scorer

[benjaminpjones]

This PR adds the ability to choose between the OGS WASM estimator and a "Voronoi" estimator... or even a user-defined function.

WASM is still the default, but one can change the estimator like so:

goban.set_local_scorer(goban.estimateScoreVoronoi);

This is very useful for testing, since it was difficult to load the OGSScoreEstimator module in the test environment or mock it. This PR raises line coverage in ScoreEstimator.ts from 20% to 89%.

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Incidentally, I believe the local scorer interface is compatible with @sabaki/influence, though I haven't tested it:

const influence = require('@sabaki/influence');
goban.set_local_scorer(influence.areaMap);

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Screenshots of Voronoi scorer:

[benjaminpjones]

Converting to draft because I am comparing the "Voronoi" screenshots to stone.defender's images, and I think these differ on the borders. My implementation has large rectangular regions, but a true Voronoi diagram would fill until neutral areas have a width of at most 1 stone.

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EDIT: Fixed in 30572d2

[anoek]

Very cool :)

[anoek]

Pretty slick, thanks for working on this!