Piglins only spawn in bastions(with exception)

Piglins should only be able to spawn in bastions, which is their home. The piglins would only spawn there once, but will never despawn. The only way they will go is if they die. Zombified piglins should no longer spawn in the bastion(because they scare them), with the lore describing the zombified piglins being exiled to the nether wastes. Piglins should still rarely spawn in crimson forests as hoglin-hunting parties of 3-5(nearly the same mechanics as trader/patrol spawning in the overworld). These will despawn eventually regardless of name tag or player presence.