Improve font styling & it's configurability, expose font-pattern in output.

Ensure units are converted correctly between CatTrap & Balkon.

Integrate inline layout!

Finish implementing preprocessing/CSS parsing & integrating everything with test script.

Parse CSS4 Grid properties.

Parse CSS Box model CSS properties, dispatch others to FontConfig & injected dependency.

Test & fix block layout.

Unit test calc() implementation!

Draft public API for CatTrap.