Automatically swap stacks in the hotbar when they run out.

The 3 conditions that can trigger item swapping are: - Using an item (e.g. placing a block, tilling dirt) - Mining a block - Attacking an entity

In those cases, the mod will attempt to find an item stack in the player's inventory that is the same (has the same item, ignores damage and NBT) and move it into the active hotbar slot.