When a track is shared with other (sub-)conferences, add control over the display context in which the shared track is viewed. Until now, the embedded track was just displayed in the display context of the conference that embedded the track.

This is not always desirable, e.g. for ICSSP and ICGSE 2020 that should remain 2 separate entities, but use a shared schedule, and should show the other CLE in its navbar.

Submitted by Elmer van Chastelet on 19 June 2020 at 09:41