Split underground biome to correspond to surface biomes #2356
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In preparation for biome-defined: dungeon materials, cave liquids,
stone type, ores, decorations.
'_ocean' biomes now extend to y = -255 to be deeper than default
mgv5 oceans, and to create 'shallow underground biomes'.
Remove unnecessary biome lists for gravel and silver sand blob ores,
as those are already defined to only appear in default:stone.
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First step for #2339
Previously there was a single underground biome below y = -112, not very interesting. This PR splits that biome into multiple biomes that correspond to the surface biomes.
This completes the columns of stacked bomes that now run from world top to world base, that are then subdivided into the y-ranges: highland, (normal), dunes, beach, shore, swamp, ocean, underground.
@Ezhh