Added artifice biomes for limestone types
Use Biome instead of BiomeType when referencing by name
Only spawn artifice stone ores in their respective biomes.

This reduces the number of spawn checks that has to be done.
Added ferrous and nickel ore spawn
Added lead ore gen
Added cobalt ore spawn
Added manganese (Animu) ore spawn
Added silver ore spawn
Added tin ore spawn
Started utility ores
Added utility ore gen
Incrase smooth stone pocket frequency slightly