~jaro/balkon

ref: 900072d27e8068ea634d9305b1370a41da9f16da balkon/src/Data/Text/ParagraphLayout d---------
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.