Custom Villager Trades

Added an internal property to all custom trades: UTID (Unique Trade ID)

• You do not need to put this in your config file. The mod will automatically add one.
• This is intended for use alongside the new commands, allowing you to remove trades using their UTID.

Added /addCVT command, you can now add trades ingame! Added /removeCVT command, this will remove CVT-ONLY trades.