Multiplayer debugging

[jasonLaster]

We've been focusing on async debugging up to this point because it is probably the more common use case and easier.

Async collaboration includes

• the ability to share a replay with others
• the ability to leave comments that are share

The one sync-collaboration feature we have now is

• the ability to see who is currently viewing the replay

We'd like to also add

• the ability to see where other folks are in the timeline
• the ability to "follow" someone
• the ability to sync more of their UI state (console messages, tabs, pause state, etc)

There are a bunch of async collaboration features we'd like to also add

• the ability to see other peoples print statements. we probably want to group by user because otherwise it can be a lot
• the ability to organize comments by user or by "view". View is interesting because you can imagine one view per bug that you see in the replay or one view per hypothesis...

Would love to hear what other folks have in mind