Interface IUsableActionRequirements

For reference: I hate this.

• undefined for no item, no type, no item finder
• true to require an item to be specified, not found
• IUsableActionItemRequirement for anything else
  • To require that the slot gets an item from a default item finder, include validate: () => true, (it's horrible)
  • To implement a custom item finder, pass it in the finder property
  • To specify that the slot can have no item stuff specified too, include allowNone: true,
    • To specify that the slot requires an item type at minimum, however, include requiresType: true,
  • To force the actions system to pass in an itemQuality in the action using even when an item is provided, include requiresQuality: true,