Change a box’s quantity and box type

[deeppunster]

Provide a way for staff to change a box’s quantity and box type.

• A particular box can have a quantity not equal to the quantity in the box type
• Verify that no other code changes the box quantity once set
• Initial quantity set from box type when box is added to inventory
  • All ways of adding a box to inventory should use BoxManagement rather than setting the box type and quantity directly.