Worldgen API v0 [Part 3]

[paulevsGitch]

That PR adds tall Overworld support (since dimension can have any height).
Overworld require mixin to change height (same as before), but now any height should work correctly.
PR is ready for review, but probably require some testing

[paulevsGitch]

I added additional functionality into this PR - BiomeModificationEvent. It is called for each biome in the dimension and can be used for transforming biomes content (for example add more entities into the biome). Event can be called like this:

@EventListener
public void testBiomeModification(BiomeModificationEvent event) {
	// event.level - current level
	// event.biome - current biome
}

Additionally StationDimension now can provide a list of containing biomes, so modded dimensions can implement that and this event will work for any dimension. For vanilla worlds it will work automatically

[paulevsGitch]

I also fixed incorrect class in biome builder, for some reason it was text entity from Java instead of proper BaseEntity from MC