public interface LegacyV2RendererContextInitialiser
Initialises the ConversionContext such that the encapsulated v2 RendererContext is populated as would
be expected in the old v2 rendering subsystem.
This responsibility belonged to the v2 renderer. We've extracted so we can invoke it in the XHTML renderer where
appropriate for backwards compatibility (the rendering of some old macros still depend on these properties existing
in the context).