#521 Removed the chat menu and replaced it with modern commands. (Tab completions, tooltips, etc.). The chat menu has been designed 9 years ago and was originally designed to make it easier to create arenas. These days, tab completion has improved enough to be the better choice.
#521 Removed the commands: /bbjoin, /bbleave, /blockballstop. They are now integrated into the /blockball command which now has got the aliases /soccer and /football.
#521 Added new options to the config.yml. Rename or delete your current one to access them.
#490 Replaced old sign handling with MCTennis style sign handling. You need to recreate your signs when you install this update. Signs now simply execute the /blockball join command instead of being a custom implementation. Sign handling may be further changed in the future.