0.2.0+alpha.3

Changelog:

• Fixes all of threading issues in vanilla worldgen and worldgen-related code
  (please open an issue if i missed something)
  This also let C2ME vanilla worldgen behaviors match vanilla. (in theory, which need testing)
  This also fixes some rare crashes that happens on startup.
• Finally fixed compatibility issue with BetterEnd on production environment.
• The test system now tests every biome and structure that can be naturally generated in
  the world to ensure test coverage.

Looking for 1.18 builds? Here it is.
These builds don't have releases so use with caution.