This task is an advanced task and requires deep understanding of the Tour feature.

Please make the following improvements and fixes:

- The elapsed time should appear to the left of the slider. The total time should appear on the right. Check out "vlc" to see how it should look. If no tour is loaded the appearance should match: "--:--" (like done in vlc).

- Make Update::change work with all fields (now it uses only "balloon visible")

- Fix the playback: Right now it removes items from update::create  so it becomes "Update item" during playing.