Pocket Change

Adds 6 coin types and a purse to hold them.

-Copper Coin (x1 Copper Ingot)
-Iron Coin (x9 Copper Coins)
-Gold Coin (x9 Iron Coins)
-Emerald Coin (x9 Gold Coins)
-Diamond Coin (x9 Emerald Coins)
-Netherite Coin (x1 Diamond Coin + x1 Netherite Ingot)

-Coin Purse (x4 Wool + x1 Copper Coin)