Experiment creators can add a "time in minutes" when creating a chat stage.
Mute mediators is removed: it should not have been created at the experiment level, and was a stop gap for this feature.
Countdowns are rendered for all participants.
When the time has elapsed, human and agent participants can no longer respond.
Note: There can be a bit of latency sometimes before the discussion is "ended". I think this is because the "update" logic is awaiting and the mediator typing simulation is also awaiting. These are done in parallel, but there might be some lag.
Fixes #308.
Note: There can be a bit of latency sometimes before the discussion is "ended". I think this is because the "update" logic is awaiting and the mediator typing simulation is also awaiting. These are done in parallel, but there might be some lag.