Reduce ocean size, add deep oceans
Add most new biomes to the biome lists

- All the rare variants still need another rarity.
- Vanilla uses more biome groups than just IceBiomes and NormalBiomes
now. For now, all biomes are placed in our two groups, but that's just
because Terrain Control does not support more groups yet.
- Borders and isles have not been added yet.