Backpacked

WANRING: Just like previous updates, this update may introduce changes that will break previous verisons of the mod. To avoid any loss of items, please empty all your backpacks before updating. ALSO BACK UP YOUR SAVES (INCLUDING CONFIGS) SINCE THIS IS AN VERY UNSTABLE DEVELOPMENT VERSION!

✨ Added a new option in the client config to control the unlock mode of unlockable slots. This option can be controlled directly in-game from the backpacked inventory. There are three modes, Enabled, Purchasable, and Disabled. Enabled means an unlockable slots will always appear interactable even if you don't have the funds to unlock it. Purchasable means an unlockable slot will only be interactable if you have the funds to unlock it. Disabled  means that unlockable slots will be indefinitely disabled and cannot be purchased until you change to a different mode. Unpurchasaeable or disabled slots will appear faded out.
✨ Added new sounds and particle effects when unlocking slots
✨ Added new config options to change payment to be Items instead of Experience Levels.
✨ You can now unlock multiple slots at once simply by click and dragging over the slots you want to unlock
🐛 Lots of bug fixes that I won't write them down, but if you find any, please report them to the GitHub repo or on Discord server (https://discord.gg/mrcrayfish)