Command support without overriding onCommand()

[IoIxD]

Technically you can create commands already by listening for the appropriate event, but the modern way involves creating a seperate class that implements CommandExecutor, and then adding registering said command so that it shows up in the tab complete menu.

[IoIxD]

Reopened because the Paper decided to make it so we can't use a certain part of Spigot's API, meaning that this will have to be explicitly supported via a workaround.