~jaro/balkon

ref: ba3f061d271830dda274348ca469e0187cf4039f balkon/test/Data/Text/ParagraphLayout/Internal d---------
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.