Makes the chainsaw arm code generic, so you can attach any normal or
bulky sized item as an arm
Impl. detail:
Items-as-arms just use inhand sprites unless it has
`/datum/element/prosthetic_icon`. Currently used for chainsaws as the
only item with an implanted sprite.
Chainsaw arm nullrod now fully replaces the arm rather than being a
nodrop item.
When surgically adding any non-bodypart item, applying the item will
result in a loose fitting, and it might fall off on attack. The
following step (tape/suture) removes the fall chance.
Chainsaw arms are funny, but why stop at chainsaws beyond it being an
Evil Dead reference?
🆑 Melbert
add: Any normal or bulky sized item can be used as a prosthetic arm,
instead of just chainsaws.
/🆑
