Ore Biome Reforged

Lowered ore biome weights:

• Small biome: 0.03% (rarer than Mushroom Island), average spacing ~11,100 blocks
• Medium biome: 0.13% (on the same order as Mushroom Island), average spacing ~10,300 blocks
• Large biome: 0.55%, average spacing ~9,900 blocks
• Super biome: 2.2%, average spacing ~10,000 blocks

下调矿石群系权重：
小群系0.03%（比蘑菇岛稀有），平均间距~11100 格；
中群系0.13%（和蘑菇岛同量级），平均间距~10300 格；
大群系0.55%，平均间距~9900 格；
超级群系2.2%，平均间距~10000 格。