[Enhancement]: Stabilize collaboration

[CodeDoctorDE]

Which feature is your request related to?

No response

Describe your request for enhancements!

Currently collaboration is experimental since a long time.
We should finally stabilize it.
Some things which should be added

• Add useful error messages
• Hide technical options inside an advanced tab
• Add username field
• Add option to configure a "Lobby" system to not allow everyone to join
• Add browse lan games
• Add qr code (and note that the person needs to be in the same network)

In the future maybe:

• Add relay server system

Additional context

No response

Code of Conduct

• I agree to follow this project's Code of Conduct