Bugfix & pagination integration.

Merge branch 'main' of git.argonaut-constellation.org:~alcinnz/CatTrap into main

Define public APIs.

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.

Draft public API for CatTrap.