~jaro/balkon

ref: 44e4f95498da06f65f02646bcec58fd55ba287f2 balkon/test/Data/Text/ParagraphLayout d---------
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.
Prepare for test modules sharing PrettyShow.
Prepare for test modules sharing font options.
Implement BiDi resolved level reordering.
Fix style: long lines.
Fix style: small Prelude imports.
Fix style: external vs internal imports.
Fix style: unnecessary do notation.
Fix style: white space in lambdas.
Fix style: white space around operators.
Fix style: white space in multi-line lists.
Fix style: white space in exports and imports.
Fix style: bullet points in comments.
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