~jaro/balkon

ref: 0b2a78cbf854bd0ef02be2ee5cd1aa65315eab1a balkon/test/Data/Text/ParagraphLayout/Internal d---------
Fix style: white space in exports and imports.
Fix style: bullet points in comments.
Mark some lists as explicitly non-empty.
Implement generic pagination internally.
Test removing spaces around lines.
Remove collapsible spaces at beginning of lines.
Allow empty lines when hard line breaking.
Reduce test dependencies on fonts.
Properly use ICU locale identifiers.
Refactor line breaking.
Allow breaking at character bounds.
Implement trimming spaces at end of lines.
Move non-public modules into Internal namespace.