Section: Introductions don't appear for objects on supporters

Introductions relies on the writing a paragraph about activity, which, by default, is activated for objects appearing in the room, but not for those which are visibly set on supporters. We can explicitly override this if we want to.

One way to do this is demonstrated in the "Kill Doctor Pearson" example, below. It works best, though, if the supporters in question are not scenery.

Note that this is a complication that arises with the default behavior of Inform; the replacement room description extensions Tailored Room Description and Ordinary Room Description are more customizable.