Cubes near world height/depth limits are never sent to client

[Barteks2x]

This is very low priority issue as nobody will reach anything close to y=+/-8,000,000 without /tp command. And there may be other bugs that make Minecraft unplayable at so extreme height/depth.

Some CubeProcessors (like FeatureProcessor, BiomeProcessor and FirstLightProcessor) need some cubes around them to do anything. Cubes below depth limit/above height limit will never exist.