Quick switch Immo / Winter using button
How it works? :
- If Immo is in inventory and is already used, press the button to sell Immo and buy Winter
- If Winter is in inventory and is already used, press the button to sell Winter and buy Immo
- If gold is not enough to buy the 2nd item, it will not sell the 1st item
- If both Immo and Winter is NOT in inventory, press the button to buy Immo
