* Add toggleable Shopkeepers support
* Made Citizens support toggleable
To-do:
* Add enchantments, data, etc. to ingredients and result
* Add config editor GUI in-game
* Added /vtl see <player> command to see the trade prices of another player
* Added /vtl invsee command to see the inventory of a villager
* Added customizable help, success, error messages
* Added result slot options, so people can change the currency and amount of the resulting item from a trade
* Massive code rewrite for better sustainability and reliability
* Fixed villager inventory dupe bug: food in a villager's inventory would multiply 16+ times each time a player traded with the villager
* Smoothed out hero of the village, so the player never loses their original potion effect when trading with villagers
TO-DO:
* Add long-term restock cooldown
* Add enchantment, custom model data, names, and lores to ingredient & result settings?
* GUI Editor
