~jaro/balkon

ref: 5e218e2739e4175ea58ef98686426d80919e2f64 balkon/test/Data/Text/ParagraphLayout/Rich d---------
Test with only directionally neutral characters.
Test mirrored neutral characters.
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.