OpenBoatUtils

mostly internal refactor, these should be the only two user facing differences:

• 1.21 support
• Removal of fixes for dedicated servers. OpenBoatUtils itself was never intended to run on servers, I may at some point port the testing commands over to a proper server mod, but its quite unlikely as it isn't something I would personally use. If you or someone you know is capable of writing server mods/plugins and you want to write your own to use OBU, take a look at the packet api.