~jaro/balkon

ref: b9e2a941c9ef51725eac029e46453373db7b980a balkon/test/Data/Text/ParagraphLayout/Internal d---------
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.