Traveler's Backpack

✨ Added config option to prevent multiple players from accessing the backpack simultaneously
✨ Added a swap backpack feature that allows changing the currently equipped backpack without needing to unequip it first
🔧 Changed backpacks RenderType to Cutout
🐛 Items can now be removed from upgrades' filter slots only by left-clicking, to prevent duplication bugs with items that allow right-click interactions
🐛 Fixed duplication bug