Hide Player timeline for live videos?

[LukasKalbertodt]

First attempted here (but then reverted). Paella can hide the timeline, which might make sense for live videos. The important question here is:

Are there use cases where a timeline for live videos is useful? Here we need reports from universities using live streams.

Apart from that, the Paella impl seems to have some problems (from here):

Just chiming in here as this is also waiting for David's feedback before we merge this: I noticed two visual things (that should be fixed on paella's end I believe): The progress bar is now cut-off on the right side (or rather it's not rounded anymore, like it was before this change):

And I think when the progress bar/timeline is hidden for live events, it would make sense to also hide its background/shrink the control panel accordingly: