Update and fix shopkeepers integration (#412)
* Update and fix shopkeepers integration
* `wrapTradingRecipe` -> `tradingRecipeToList`
* `onShopKeeperCreated` > `onPlayerCreateShopkeeper`
Also imports
* Improve `ShopKeeperTag` errors
* Implement `getJavaObject`
* `EntityTag.shopkeeper` meta fix
(
commit: bf6a1cc)
