TuneUp Version 39

New Repeat Playlist option:
- Repeat Playlist is now included in the main Tab order.
- Press Enter or Spacebar on Repeat Playlist to toggle it On or Off.
- The setting is remembered when TuneUp is closed and reopened.
- If Continuous Play is On and Repeat Playlist is On, finishing the last song
  returns to the first song and continues playing.
- If Repeat Playlist is Off, TuneUp stops at the end of the playlist.
- Main remains temporary and does not automatically advance.
