Moving Items from the Bottom Inventory into ItemInputButtons will now call all the available ItemInputButtons and is canceled if one button cancels the action.
Added new InventoryUtils methods
InventoryUtils#getInventorySpace(ItemStack[], ItemStack) allows to check custom ItemStack Arrays for space.
InventoryUtils#calculateClickedSlot calculates and places items into slots of the inventory of the Event. This code was moved from CustomCrafting into WU to fix issues regarding it more easily and prevent duplicate code.