Fixes modified MA overlays potentially causing duplicate overlays #173
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Mirrored on Skyrat: Skyrat-SS13/Skyrat-tg#24455
Original PR: tgstation/tgstation#78719
Also optimizes the update_icon proc a little bit, especially as a round goes on, since everything is stored as an appearance (or text, gross) this allows us to only call on overlay update code if the managed overlays change.
This also fixes some sources of null overlays but it ended up being more things than I should shove into this pr if I were to fix all of them.
Should probably be testmerged for a little bit to make sure nothing weird comes from assuming everything being passed in has an appearance var.