~jaro/balkon

ref: 904bd77ec7a8460971bec4a592629ee74c8aec3f 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.