Allows the player or pack author to customize the villager's trade items

How to use:
Editing Configuration Files
(Note: After editing the configuration file, the original villagers will not be affected, so the villagers' classes need to be refreshed)

Support for editing:
1. Transaction cost and finished goods and quantity;
2. Experience gained after trading;
3. Trading classes and levels of villagers;
4. Maximum discount rate and maximum number of transactions per transaction.

Current deficiencies:
Transactions of multiple items (costs) are not supported;
nbt is not supported.
You restart the game every time you refresh.