A new feature was added that allows vending machine stock management.
Now only authorized users can place "vendingmachines.place", reload and modify the vending machines.
Messages were added for low stock condition and inability to place machines due to permissions.
The default stock for the vending machine items was set to maximum for players with selling permission and zero otherwise.
The stock now lowers when items are bought and increases when items are sold.
'Stock' and 'OwnerName' fields were added to vending machine instances and are stored in the config files.