Add opentype features to typetester

[markboulton]

[RoelN]

If Specimen Skeleton would make use of https://github.com/Wakamai-Fondue/wakamai-fondue-engine/ this would be easy to do. (It'd basically give you access to everything inside the font, variable and features!)

[markboulton]

This would be great, @RoelN. When you say 'easy'... ;)

Could you give me a nudge in the right direction for integration into 11ty and Specimen Builder?

[RoelN]

This would require a change in Specimen Skeleton Support, instea of the builder/11ty side. The current variable data pipeline should be replaced by Wakamai Fondue Engine, while the rest of the font details would need to be added in a way the Specimen Skeleton could handle them. I figure a day or two worth of work, including adding tests!