~jaro/balkon

ref: 278ffb65d2bef8d684bdd94fd3b1f546efd6a41d balkon/test/Data/Text/ParagraphLayout d---------
Use CSS-compatible line height settings.
Fix pretty printing for fragmented spans.
Upgrade Fragment to contain pen position.
Clean up ParagraphConstruction.
Use infix operators for constructing test data.
Implement "plain" interface.
Create "plain" interface.
Add module for working with rectangle coordinates.
Add explicit scale to test font.
Separate tests by module.