[Feature Request] Disable natural spawning for villager types.

[Mike-U5]

Exactly what the title says:
Sometimes you want to leave spawning certain villager-types up to other mods.
As such, I'd be nice if there was an option to not spawn custom villager naturally in vanilla villages.

If Biome-specific villagers ends up being implemented at all, then this request is probably unneeded since one could just set it to spawn in no biomes.

[NielsPilgaard]

Have you had time to look into this yet? I'm trying to base some progression on custom villagers, but the shear amount of vanilla types make the custom ones a bit too rare.