Updated SongPictureInfo use to async copy of picture data stream. Update other classes accordingly.

Harmonia.UI/Views/PlaybackBar.axaml.cs

@@ -45,29 +45,4 @@ public partial class PlaybackBar : UserControl
         _viewModel.CurrentPosition = slider.Value;
         _viewModel.IsPositionChangeInProgress = false;
     }
-
-    private void PlayButton_Click(object? sender, RoutedEventArgs e)
-    {
-        _viewModel.Play();
-    }
-
-    private void StopButton_Click(object? sender, RoutedEventArgs e)
-    {
-        _viewModel.Stop();
-    }
-
-    private void PauseButton_Click(object? sender, RoutedEventArgs e)
-    {
-        _viewModel.Pause();
-    }
-
-    private void PreviousSongButton_Click(object? sender, RoutedEventArgs e)
-    {
-        _viewModel.Previous();
-    }
-
-    private void NextSongButton_Click(object sender, RoutedEventArgs e)
-    {
-        _viewModel.Next();
-    }
 }