Release v4.159.0

Changed

• ArrangementConverter.ToSyntax converts a Scene flow or freeform arrangement (layouts, screen templates and dialog templates) back into the Screenplay ArrangementSyntax it is written as, the inverse of ArrangementConverter.Convert, so a host that holds Scene declarations (Studio's own shell exported as a screen template) can write the arrangement as typed Screenplay instead of dropping it (part of Cratis/StudioIssues#816)

Proof: when_converting_to_syntax specifications convert flow (row, column, grid, grow, span, size-class overrides) and freeform arrangements to syntax and back through Convert and compare with the original.