*Please also update the core library to v1.5 as this includes a lot of refactoring to how GUIs work

- Added option to increase the allowed capacity of each individual present type from anything between 1 and 54. If present types have different capacities this will be displayed on the present selection screen so that the player sees the difference in what they are picking.

In making the above change I also did a lot of testing around the refactoring I did and discovered 2 bugs which are now fixed:
- Items could get lost if the server is stopped and either a present fill or present receive menu is open. I have added a shutdown hook that will close inventories and resolve items before the players are kicked on shutdown.
- Items can get shift clicked into the present receive menu if they are the same type but only the original quantity of items could be retrieved from the present. To stop this I have prevented stacking of items inside the present with that of a player's inventory until the item has left the present.

Thank you for the continued interest, support and suggestions for my plugin, and of course, have a fantastic Christmas! =]