filled biome/dimension

Not applicable
Issue description

I want a perfectly-filled biome/dimension(that means no holes like caves and mines,and it will be even better if i can choose if it will natually spawn in a specific biome/dimension) and is it possible?this request is URGENT!

Issue comments

And also biomes that spawn only ONCE in a dimension,and a

spawn dimension at <x> <y> <z> spawn entitys <true_or_false> spawn structure <true_or_false>

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