Rename InventoryPaint to InventoryDrag, fix imports
Revert to code in @YLivay's PR
Use InventoryCreativeEvent
Add getSlotType() from @YLivay's PR
Remove glitchy ALLOW code
Fix ALLOW result
Rename ClickAction to InventoryAction
Fix CB comments, Drag/paint confusion, add TODO update task
Switch to Map<Integer, ItemStack>