Generate more data about font

There's many more things we can extract from the font. Users now manually add this info, as is done [here](https://github.com/markboulton/specimen-builder/blob/master/src/_data/content.js) (private repo at the moment).

We could hook this up to the [Wakamai Fondue Engine](https://github.com/Wakamai-Fondue/wakamai-fondue-engine/) and generate controls for layout features, localization, language support etc.

Start by reviewing the referenced src/_data/content.js example and the Wakamai Fondue Engine project to understand the existing manually supplied font data and possible integration points. Define the scope before implementation; done should include generated controls for layout features, localization, and language support.

Written by the indexing model from the issue text.