~jaro/balkon

ref: 0b2a78cbf854bd0ef02be2ee5cd1aa65315eab1a balkon/src/Data/Text/ParagraphLayout/Internal d---------
Do not re-export through the Plain module.
Move paragraphSpanBounds to the correct module.
Clarify comment about BiDi.
Correct comment about fragmentation.
Fix style: long lines.
Fix style: small Prelude imports.
Fix style: external vs internal imports.
Fix style: white space in lambdas.
Fix style: white space around operators.
Fix style: white space in exports and imports.
Fix style: bullet points in comments.
Fix style: non-ASCII characters in comments.
Mark some lists as explicitly non-empty.
Fix typos in comments.
Improve documentation for pagination.
Prepare pagination for future layout types.
Add paragraph pagination.
Implement splitting ParagraphLayout into lines.
Implement generic pagination internally.
Separate module for the ParagraphLayout type.
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