Add a "select one" checkbox to hoard/buried

Small quality of life improvement - I often want to just take one out of the stack (from multiple items) to remove it from my buried stack, e.g. when gathering items to complete a quest.

My suggestion is, as well as the checkbox currently in the bottom-right of each item, to change it to two checkboxes: "select one" and "select stack".

It would require a small amount of coding - I think that's about it.