In-Game Custom Head Item List

Verified High Quality In-Game Custom Head Item List 2021-11-18

This script was verified by the Denizen team to be a particularly high quality example of how scripts are written.
Script is modernized and cleaned. No important functional changes. See https://github.com/mcmonkeyprojects...mmit/4a4b1432eb1c80230a4117ed8f0d59d95b8ad9cb for details of what changed.