Update pixelmatch-cpp to match the current JavaScript implementation

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Hi,

I noticed that pixelmatch-cpp appears to be based on an older version of the JavaScript implementation and is no longer fully aligned with the current pixelmatch.

The current JavaScript version is 7.2.0, while the C++ implementation still appears to use the older YIQ-based color-difference metric. The current JavaScript implementation has since moved to OKLab + HyAB for color comparison.

This raises a couple of questions:

Is there a plan to update pixelmatch-cpp to match the current JavaScript implementation?
Is behavioral compatibility between the C++ and JavaScript implementations a goal?
If so, would it be possible to port the newer color-difference algorithm and other changes from the current JavaScript version?
In particular, it would be useful to have the C++ implementation produce the same diff results as the current JavaScript implementation when given the same images and configuration.

I'm interested in using Pixelmatch from a native C++ application without requiring Node.js, so having a current C++ implementation would be very useful.

Thanks!

Confronta l’implementazione esistente di pixelmatch-cpp con l’implementazione JavaScript corrente di pixelmatch 7.2.0, concentrandoti innanzitutto sulla metrica della differenza di colore. Determina l’ambito del porting di OKLab + HyAB e delle altre modifiche; il lavoro sarà considerato completato quando i risultati di diff corrisponderanno ai risultati JavaScript per le stesse immagini e configurazione.

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