~jaro/balkon

ref: cb8797a9b1f79382d55a6160d7440bda9e312803 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.