TUNIC: Missing slot data bugfix

[silent-destroyer]

What is this fixing or adding?

Fixing an issue where certain data was not getting added to slot data, causing issues in the client mod.

This was due to the way item creation was being handled for items that change classification based on options; the items were being created but not added to slot data, which the client uses for its in-game hint system. I cleaned up the creation of those items by adding an optional argument to the create_item function to allow overriding an items default classification on creation, and instead add the necessary item data to slot data at the end of create_items

How was this tested?

Generating test seeds with the options that were causing issues and successfully connecting with the client mod

If this makes graphical changes, please attach screenshots.