Fix blades equipped to a void cloak having visible sprites

[Absolucy]

About The Pull Request

Ports tgstation/tgstation#89343, and my follow-up fix tgstation/tgstation#89373

This adds a new item trait, TRAIT_NO_WORN_ICON, which is exactly what it says on the tin - the worn overlay for said item will not be added when the trait is present, so we give it to items hidden by the hood.

I also refactored the EXAMINE_SKIP item flag into TRAIT_EXAMINE_SKIP.

Why It's Good For The Game

stealth thing having an obvious sprite tell is bad. bugfix good.

Changelog

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fix: Void Cloaks now properly hide blades and such in the suit storage from the wearer's sprite.
/:cl: