~jaro/balkon

ref: 8ec0fe09ec568b7e5309df9dc37cd3c0f7635283 balkon/test/Data d---------
Improve BiDi handling of numbers and neutrals.
Test with only directionally neutral characters.
Test mirrored neutral characters.
Add shaped runs output for bidirectional text.
Add tests for mixed text direction.
Test spanToRuns independently for scripts/directions.
Integrate BiDi levels with spanToRuns algorithm.

Span/box boundaries no longer reset directionality.

BREAKING: Text with no strongly directional characters would
previously be treated as having no direction. It will now be
treated as having the direction defined in TextOptions.
This affects calculated positions.
Convert legacy span directions into levels.
Move BiDi Level to separate module.
Add expected run lengths to test data.
Add more sample texts.
Add helper function for run-length encoding.
Deduplicate emptyFont in RunSpec.
Generalise text from SpanData for other tests.
Deduplicate code in SpanData.
Add Arabic examples to spanToRuns tests.
Add shaped runs to manually test pagination.
Consolidate tree types into one.
Test interaction between boxes and mixed script.
Test soft breaking on box spacing.
Next