continuation used by interaction mechanism at filter detection during
loading documents
If during loading time the filter can't be detected and wasn't given at calling time,
a possible ::com::sun::star::task::InteractionHandler will be used.
(it's a a part of used MediaDescriptor)
A NoSuchFilterRequest will be used then to start right interaction on that to
get a decision wich filter should be used for given URL. A possible continiuation
of that can be this XInteractionFilterSelect. It will transport the decision back to
generic filter detection and force using of it. Of course it's possible to abort
the loading process by use another continuation ::com::sun::star::task::XInteractionAbort.
