Realistic Ore Veins 1.15.2-5.1.5

Changes

• Fix possible ArrayOutOfBounds exception in cluster veins with low cluster count.
• Add a uniform option to sphere veins.
• Fix various broken things with predicate rules, which affected both biome and dimension rules. They should now work as intended and the readme has been updated to match the desired functionality.

A couple internal fixes such as properly registering the mod's Feature<?> was fixed. Many more test veins were added - unit tests are coming soon:tm: