ScoreFixer

Additions:

• Trying to run the functions in score_fixer:util/ or score_fixer:settings/ now also fails after running score_fixer:uninstall

Changes:

• Changed the way the join & leave detection works to support 1.21.9+
  • In 1.21.9+ Singleplayer, the #score_fixer:left_game event may now run in the same tick as (but before) #score_fixer:joined_game, when the player is already online again

Bugfixes:

• Fixed an issue where all players were iterated over when someone left, instead of stopping once the correct number of players has been found