Release v21.15.0

Changed

• A specification step that names a value the specification holds is read as the construction that value was put together by, so a scenario stating its event or its command through a member reads the same as one constructing it inline (#2412)

Fixed

• Screenplay options are resolved once, at whichever entry point sees them first, so emitting a model directly and reaching the same model through a generation no longer resolve the domain name against two different fallbacks (#2401)