~jaro/balkon

ref: 74594e80185c479dd7d4b10db0864ff580f3cb1d 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.