~jaro/balkon

ref: e7cfa46db489fb319f0191c54292d92209be88a1 balkon/src/Data/Text/ParagraphLayout d---------
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.