Handle chats with no name
If the room has no explicit name set and:
- You're the only member: 'You'
- There are only two members: The other members name, e.g. 'Joe'
- There are less than 4 members in the room: All those names separated by comma, e.g 'Joe, Mary, Wilko, Nathan'.
- There are more than 4 members in the room and the room has no address (no way to check for that in the current SDK): All names and a suffix: 'Joe, Mary, Wilko, Nathan and others'
- There are more than 4 members and the room has an address: 'Public chat'