Results 3 issues of MihailRis

- ~~heightmaps generation~~ - ~~block layers~~ - ~~biomes~~ - ~~plants~~ - structures - ~small structures~ - ~structures rotation~ - ~biome-dependent small structures~ - ~ores~ - generator Lua state isolation -...

Lua does not support parallelism, so it's must be implemented with isolated lua states. Parallelism will be useful for world generator.