* Changed from QStyledItemDelegate to QItemDelegate for the checkboxes (visual change)
* Replaced matroska tools with ffprobe for chapter information (dependency change)
* alternating row colors per output file group and ditch cross-hatch for things not marked 'keep', just style it as "disabled"  (visual change)
* lots of other little things and cleanup affairs. I'm almost not embarrassed to say it's mine now.