Code is now capable of loading merch onto multiple store shelves during load shop.
Still need to fix refresh, loading merch after creating merch and making transactions, the shelf buttons, as well as saving the state of the shelves to the server.
During CreateInteriorRefList, save shelf positions in a separate vector and ignore their buttons. In Load, recreate the shelves and their buttons from the shelf vec.
Also start storing FormIDs in a header file so I don't have to keep passing Keywords into all the functions from Papyrus.
