~jaro/balkon

ref: cb3f4787147fa665b2f7f8481850751a408fad9d balkon/src/Data/Text d---------
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.
Remove collapsible spaces at beginning of lines.
Allow empty lines when hard line breaking.
Support hard line breaks.
Add internal functions for "shaped runs" output.
Document considerations for beginsText/endsText.
Properly use ICU locale identifiers.
Fix typo in comment.
Clarify spanLanguage and add basic ICU conversion.
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