~jaro/balkon

ref: 7a73994fb385739e086f1354542384895fa842b7 balkon/src/Data/Text/ParagraphLayout 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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