Release 2.3

Added:

1. 1.19 Support
2. Java 8 Support
3. Added ? to the commands plugin will auto not complete them

Fixed:

1. UpdateChecker always failing
2. TabCompleter getting bugged sometimes if special conditions are available

Changes:

1. Sub-Completer ignores everything in whitelist mode if the command is not mentioned in the config
2. Removed plhide.sub-whitelist-mode permission and subargs now depend on regular whitelist mode
3. Default group is no longer added to everyone, it will only be used automatically if no groups are found for the player

And a few more bug fixes!