Attempt to fix failure to query system fonts.
Hardcode fallback fontfile, associate vals per span-line not per span.
Enforce harfbuzz scaling to be of Double type.
Actually query for desired font, remove needless Maybe.
Improve font styling & it's configurability, expose font-pattern in output.
Ensure units are converted correctly between CatTrap & Balkon.
Finish implementing preprocessing/CSS parsing & integrating everything with test script.
Draft grid preprocessor which sucessfully compiles.
Parse CSS4 Grid properties.