Update changelog on text with no strong direction.
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 helper function for run-length encoding.
Deduplicate emptyFont in RunSpec.
Generalise text from SpanData for other tests.
Deduplicate code in SpanData.
Prepare for extending ProtoRun.
Move ScriptCode to appropriate module.
Add Arabic examples to spanToRuns tests.
Fix documentation: internal references.
Fix documentation: link to layoutRich.
Fix documentation: missing boxSpacing.
Set release date for v1.0.0.1.
Describe manual testing of pagination.
Add shaped runs to manually test pagination.