~jaro/balkon

ref: 97faca5ffecc168c774af90056c365f03e047631 balkon/test/Data/Text/ParagraphLayout/Internal d---------
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.