Adding support for Variable Fonts, by integrating SamsaCore.js

[wentin]

Would love OpenType.js to support Variable Fonts, can read VF related data tables, and render SVGpath for variable fonts's named instances and custom instances.

SamsaCore.js currently does these features above, but lacking other OpenType.js basic features, like compose a word, getting kerning, etc. Seems it would be beneficial for both projects to merge effort.

https://github.com/Lorp/samsa/blob/master/docs/samsa-core.md

[vinuel]

There is also variableFont.js ... very small and easy to use. I use it in combination with opentype.js. Maby interessting:
https://github.com/Monotype/variableFont.js

[Typogram]

There is also variableFont.js ... very small and easy to use. I use it in combination with opentype.js. Maby interessting: https://github.com/Monotype/variableFont.js

variableFont.js doesn't render variable fonts' path data. it only read its axes data.

[Connum]

Variable font rendering landed via #699