Invisible Armoury

Adds invisible variants of vanilla weapons, currently Unarmeds, Katars, Scepters, and Bells.
Doubt I'll add more due to wanting to keep the shop small and neat, while being fairly exploit-friendly.

Created in the interests of those who wanted strong Unarmeds or invisible Katars for visual clarity, included Scepters and Bells for similar reasoning.
Inspired by Foxs Witch Spells by Shy_RP (Discord).