Draft utility to aid resolving conflicting dataflow.

Ensure units are converted correctly between CatTrap & Balkon.

Integrate inline layout!

Unittest & fix abstract layout.

Unittest basic grid sizing.

Draft grid width-sizing code.

Test & fix block layout.

Draft flow layout computation.

calc() interpretor & multidirectional text to be added later.

Draft new CatTrap API which hopefully is easier to implement.

Unit test calc() implementation!

Draft public API for CatTrap.