~jaro/balkon

ref: a2d91928eca26673b19d166f2af3ee8da527df76 balkon/test/Data/Text d---------
Test Rich pagination.
Test Rich line wrapping.
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.
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