Port passive (datum) HUDs from /tg/station #21389
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See title. Moves handling of Med/SecHUDs from the frankly inscrutable system we had previously to a datum and trait-based system courtesy of /tg/, with some minor hammering from yours truly to get it working.
Also adds some backend stuff to make this possible / easier, like built-in trait support on obj/item/clothing and obj/item/organ, as well as ADD_TRAITS and REMOVE_TRAITS helpers.
I Have Not Tested This, Do Not Merge It Yet