Reformat golden test output.
The new format should be more in line with the overall code style and
should be more legible even when extended in the future.
Qualify Plain ParagraphData.
Use concise expression for readFromFile.
Prepare for test modules sharing Golden definitions.
Colocate golden test definitions with specs.
Colocate definitions of golden test paths.
Rename golden files for easier tracking.
Prepare for test modules sharing PrettyShow.
Prepare for test modules sharing font options.
Do not expose modules unnecessarily.
Fix compatibility with base < 4.15.
Make demo font size better match window.
Improve terminology around fragments.
Fix documentation: missing Paginable.
Fix documentation: missing SpanOptions.
Make sure cabal.project is included in distribution.
Set release date for v0.3.0.0.
Fix documentation: document remaining names.
Fix documentation: export dependencies of exported names.