Layout inline blocks

NOTE: Replaced elements can be implemented via a wrapper.

Incorporate inline-blocks/etc into the layout model.

Improve documentation & naming for flexbox.

Fixes to traverse & retrieve laid out text!

Test flexbox pagination!

Integrate FlexBox layout

Integrate flexbox CSS property parsing.

Implement utils for computing flexbox-relevant sizes.

Adjust flexbox terminology

Parse FlexBox CSS properties, draft alignment code.

Draft flexbox layout

Fix release of CatTrap 0.4 (as I should've called it...)

Test table lowering

Support colspan on column elements.

Parse & apply CSS <table>-styling properties.

Allow styling table columns & rows!

Implement table layout.

Implement basic table layout.

Implement more of <table> layout

Expose text data from main module.