Annual Request: Display Markers In Editors

…and also Time Sig and Tempo Changes.

I shouldn’t have to exit the Key Editor to see markers or T/S or tempo changes.

I would not want to see tempo changes in the key editor since I usually work with very dense tempo modification (every quarter note or eighth note). So, I would want this to be an option that could be disabled lest the tempo information gets in the way of actual key editing.