Ultimate VeinMiner

• Complete remake of test position logic.
  • Functions (add new vein-mineable blocks, regenerate block cache) may take a while to start execution because of the asynchronized forceload behavior. The "Waiting for Server" screen will be displayed while waiting for the test position to be loaded.
  • Improved multiplayer compatibility where multiple player uses the test position at the same time.
  • Only one player at a time is allowed to modify the stored test position. Others will be put in a waiting queue.
  • Test position can be in non-vanilla dimensions and will be announced after being modified by a player.
  • Forcefully using an unsafe test position to run functions is now again possible.
• The default block list will now only be initialized when a player is online.
• Configuration dialogs are now generated using NBTs, not strings.
• Blocks in vein will only be destroyed when it is loaded.

Fixes:

• Enabling vein-mining function only notifies the player who runs the command.