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Introduce Argument Processor This is a new menu component that handles the arguments of the command to open the menu. It's more loose-coupling than the old approach to the argument handler. By supporting multiple processors, you can make all sort of possible ideas to work with the arguments of the menu. Developers can even make crazier ones of their favorite without duplicating the same code. More details can be found here
Support Tab Complete on the command to open the menu This is one more benefit of the Argument Processor. Developers can specify the suggestions when a player do a tab-complete on the open-menu command.
Deprecate Args Menu This menu type is deprecated in favor of the new Argument Processor. You should switch to the new Argument Processor ASAP. It's planned to be removed in the 8.0 update.
Deprecate Alternative Command Manager This feature is deprecated because of inactivity. I don't see a reason to keep maintaining as a main feature of the main plugin. If you are using this, you are recommended to use the commands.yml or wait for a specialized addon. It's planned to be removed in the 8.0 update, and will be moved to an addon.