Measure delay in DynamicData start time and real audio start time and consider refactor

[ewjmulder]

    // Signal scenario that playback has started. just before starting the fill buffer loop.
    // This will cause a slight mismatch of max a few milliseconds between the timers in the DynamicData and the actual playback,
    // but this is the last place where we know the difference between a newly activated scenario and an existing one.
    scenariosToActivateCopy.forEach(ActiveScenario::nextPlaybackStarted);

Solution can be to save some state of start/restart in ActiveScenario with is false at creation and set to false at restart. But is that worth it or is hte delay neglectible?