~jaro/balkon

ref: cb3f4787147fa665b2f7f8481850751a408fad9d 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.