~jaro/balkon

ref: 5d0bf7627c61fa5a70757ad5fe726b04eaa657c6 balkon/test d---------
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.
Fix style: white space around operators.
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