Trade Vault

# Summary

A new block that would be useful for shops on servers. It has similar properties to the Vault, but instead of requiring keys, it requires any item. Each Trade Vault has one slot inside, and the only way to take items out of the slot is by replacing it with something else. This would be interesting in multiplayer, as you could use it to make functioning shops.

# Example of use in game

For example, by using an item filter contraption and other things, you could make a shop that may require 2 diamonds to purchase 64 apples. Using hoppers, you could also restock the item inside and automatically replace the old item with a new item.

# Crafting Recipe

By combining a Vault (collected from Silk Touch) and 4 redstone, you could craft the Trade Vault.

# Random Specifics

Blast-proof from all forms of explosions; including TNT, End Crystals, TNT Minecarts, Creepers, etc.

Takes just as long to mine as a regular Vault.

Upon breaking, the item(s) inside does not drop.

Comparator can detect the number of items inside the Vault.

A hopper going into the top of the Trade Vault would replace the item inside the Trade Vault with the one from the top hopper, but only if there is a hopper at the bottom of the trade vault. The old item would go into the bottom hopper.