~jaro/balkon

ref: 3e3fef4440b5d982144bdb4b13a3d784ba686233 balkon/test/Data d---------
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.
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.
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