Mumble - Option to self-register

[rakiru]

This will require ACLs being finished (working on them at the moment), so we know if we have permission to self-register, but since we have certs now, this may as well be an option. Allow the bot to register itself on join if it isn't already (need to check how to see if we're registered).

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[gdude2002]

This is actually needed for permissions granting and stuff, isn't it? Would definitely be a good idea to do this.

[rakiru]

Admins can register users, and it's those same people that would be actually giving you permissions, so it's not needed. It would just save a couple of seconds for the admin to right-click -> Register the bot.