[suggestion] Callback for creating Abyss locusts

[zarawesome]

in-game support for the item Abyss is, well, abysmal. Rather than attempt to improve locusts.xml, perhaps a better solution would be to have a callback when a locust is created, so that it can be implemented in lua instead.

[im-tem]

What is stopping you from using MC_FAMILIAR_INIT or the very first MC_FAMILIAR_UPDATE? There shouldn't be any differences with how you handle locusts and any other familiar