~jaro/balkon

ref: b464ad93704970f027c06d6915a07bf3d8011845 balkon/src/Data/Text/ParagraphLayout d---------
Use CSS-compatible line height settings.
Upgrade Fragment to contain pen position.
Use CSS3 terminology for fragments and containing block.
Avoid reimplementing Data.Text.Lazy.fromStrict.
Implement "plain" interface.
Use Rect in "plain" interface.
Create "plain" interface.
Add module for working with rectangle coordinates.
Separate modules.