~jaro/balkon

ref: 4ff2ea2a04080eb644de0fba63237633c025ab0d balkon/test/Data/Text d---------
Test Rich layout.
Limit internal imports in interface tests.
Make paginateAll generic.
Deprecate the Plain interface.
Embed TextOptions in ResolvedSpan.

SpanOptions are relegated to the legacy Plain interface, and
TextOptions are now being used internally.
Add user data to spans.
Add line numbers to laid out fragments.
Qualify Plain interface.
Future-proof records with options.
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.
Make demo font size better match window.
Separate internal plain Paragraph/ParagraphLayout.
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