Feature Request: Global Progress Bar

[bleonar5]

In reference to: https://lookit-mit.slack.com/archives/CHG0M1LA1/p1693953756833779

It may be useful to some researchers (especially those running longer studies) to have an option of displaying a global progress bar at the bottom of the screen (showing a running percentage based off the number of frames completed so far). This would give participants an indication of how close they are to the end of the study, to discourage them from dropping out.

It's unclear to me at this point how intensive this feature would be to add, since it would need to either be added to every frame type individually or it would need to be added as a global property of the frame-window itself. Plus, it may need to be based on something more sophisticated that simply "how many frames in the sequence have been completed", since it's possible to skip between different frames in the sequence based on conditionals.

Overall, this probably isn't a high priority, but it's worth discussing when there's time.