Just Enough Dimensions

• Fix some potential NPEs in JSON saving/loading code. Fixes GH #24.
• Fix an NPE in reading a custom Light Brightness array from JSON
• Add warnings to the /jed vanilla command equivalents if run in DerivedWorldInfo dimensions, where they won't have any effect
• Add an option for the "normal game mode"
  • This is useful if the players initially join into a ForceGameMode dimension

Original build time: 2018-04-11 22:00:19 UTC+3