~jaro/balkon

ref: dd54d63aabb7d47dce58d59a96a61467815f06ff balkon/test/Data/Text/ParagraphLayout/Rich d---------
Add tests for mixed text direction.
Consolidate tree types into one.
Test interaction between boxes and mixed script.
Test soft breaking on box spacing.
Test line breaking in boxes.
Make paragraph direction explicit in tests.
Add required textDirection to TextOptions.
Test layout with mixed font sizes.
Test Rich line wrapping.
Test Rich layout.