Feature request: way to make newly created items invisible

[aaronfreed]

Leaving a way for the player to make them teleport them in would be left up to the scripter/mapmaker, naturally. One use case for this: there’s currently no way to replace items of one type with items of another, so currently you’d have to wait for the item to teleport in, then replace it, which would look terrible if the item shapes are different. It also isn’t possible to create items that would teleport in only after specific game events occur. Since monsters can be set to teleport in immediately after being created, it seems only reasonable to do the same for items.

I might be able to write a PR for this myself, but I’m making an issue for it partly to remind myself.