chat room isolation option

[TPonsky]

We are using the popout feature only. It would be nice to set each chatroom to be isolated from other chat rooms on the tab bar, but still show private chats. I had to use CSS to hide the tab bar chat rooms but then that means that private chat tabs never show up so users don't know they are invited to a private chat. We use this chat system to do chat rooms across many events. We can't have other rooms for other events showing up and getting cross chat.