[REQUEST] Custom world generators

[turtledude01]

Being able to use a custom world generator (EG: TerraformGenerator) to modify the generation parameters of the Resource world, while currently possible via Multiverse config editing, does not appear to be supported and causes some issues.

Currently: The spawn chunks in the Resource world are generated using the regular generator, while the rest of the world use the Multiverse configured generator

What I would like to happen: Either detect Multiverse and let it handle the generation, possibly even offload the world creation and deletion to Multiverse via the API, or allow defining a custom generator within the ResourceWorld config.