* update_icon() improvements
Fixes some update_icon() calls to properly call parent and use update_overlays() and update_icon_state().
The rest of obj/item fuck it
* Suggested fixes, also passes the linter
* I always forget . = ..() is faster than return ..() FOR SOME FUCKING REASON
* Actually this is better
* Signilzes datum/action to update its icon when its connected item does.