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Added existing_typesof() proc

Rob Nelson requested to merge pull/7618/typesof into Bleeding-Edge

Created by: unid15

existing_typesof(/obj) works almost like typesof(/obj), but most of the "abstract" paths like /obj or /obj/item are weeded out.

It works by going through each path in typesof(/obj) and checking if its icon or icon_state are equal to null. If they are, the path is removed from the result

Results are cached

Fixes #7608 (closed)

Fixes #7350 (closed)

Also changed / commented out some of the items' icon_states which were previously invalid (so that this proc can work better). Some instances of typesof(/atom) were replaced with existing_typesof(/atom)

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