Support mumble client certificate

[treaki]

please add the feature for mumble client certificates so that the bot can be registered on server side.

On our server it is not allowed, for spam protection reasons, to send text messages if the user is not registered so that bot is not really useful.

Thanks in advance

[TheJJ]

To be honest, we don't use the project any more, as we have switched to Matrix as messenger. It already supports proper group chats with history, voice calls etc. That said, we will not implement the feature, but if someone (like you) does, we can merge that.