Marker Track improvements

  1. Allow to be activated via Key command.
  2. Allow a named marker track to be toggled on/off with PLE
  3. Allow the Activate button to be moved with “Track Controls Settings” so that it can be put in a more convenient place depending on workflow (I prefer to keep my tracks at 1 row height, Activate is always on the second row).
  4. Put a button on the inspector panel to Activate currently selected Marker track.

Fix the bug where it doesn’t remember the Marker IDs setting (already notes in the Issues forum).

If this was a new feature I could kind of understand the niggles, but apparently this is a direct port from an existing feature in Nuendo so I’m surprised it feels so half-baked.