I'm going to reorganize the mapgen registration. It feels wrong that all biomes are registered first and then the ores and decorations are registered as bulk into all biomes at once
I want to register a biome (or group of the same biome, e.g. taiga and taiga_ocean) and then register the ores and other stuff for that biome. That would mean, that I have to register the same ore/decoration multiple times, but I don't think that this is a problem