Add `from` and `to` for item splits

[earthiverse]

Changes:

• Adds to, from, and q to the game_response for split
  • from is the slot the item was split from
  • to is the slot that has the quantity the user requested to be split
  • q is the count of the items in the new slot

[kaansoral]

When you refactor the code too, it usually requires a deeper review as it might introduce loopholes. Did you review your code from this perspective? If you're confident I'll merge

[earthiverse]

Did you review your code from this perspective?

I tested it locally in Docker and it looks good to me.

First split was trying to split a cring (failed -> OK) Second split was trying to split a stack of 80 potions with a quantity of 160 (this is a small optimization, we're now checking quantity requested >= quantity available instead of quantity requested == quantity available), it just returns the original stack position Third split was splitting 1 potion off that 80 stack, which also was OK