Topic: tag editor and title display
It would be nice to (i) add a tag editor for modifying the metadata of the audio files, (ii) display the title of the songs without file extension, e.g., 'yesterday once more' instead of 'yesterday once more.ape' in the title column, and (iii) automatically avoid duplicate, for instance, 'xxx' should not be added to playlist once more when we already have 'xxx' in the playlist.