[Robotgiggle]

Using patterns that work with items in the inventory or offhand in a spell circle is currently a little weird, as they still rely on the inventory of the casting player (or don't work at all, in the case of an unbound cleric circle). This PR fixes that issue by adding the Storage Locus, a spell circle component which enables a circle to have its own inventory distinct from the casting player.

Here's a super basic phial-making circle using the locus. You could easily add more automation by hooking up some hoppers to the locus and adding a dropper to provide the media. Automating phials, casting items, and anything else that needs an offhand is now possible!