Cuztomizable Shop GUI

You have to manually add the items in this shop GUI

/shop category add <name> - Add a new category
/shop category delete <name> - Delete a category
/shop category edit <category> <name> - Edit a category
/shop item add <category> <name> <id> <price> - Add an item into a category
/shop item edit <category> <name> - Edit an item in a category
/shop item delete <category> <name> - Delete an item in a category
/shop reset - Reset the Shop