Added a new inventory that allows the purchase of an inventory or shulker and see the content before setting up the purchase (Thanks to lunar for donating for this feature).
Fixed the lore that should be displayed for shulkersbox. You now have the same lore as for inventory sale.
Added zMenu support for savings per Item. You now have more options for configuration.
Various minor corrections on economies
Fixed the CoinsEngine economy that does not use the values of your configuration.
