Implement the deletion functionality for the *api/song/data* HTTP endpoint.
When a song is deleted using this endpoint it also deletes the song attribute record for the song.
If the Directory that the song is stored in is empty after deletion, delete the directory as well.
### Related to
#17
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Implement the deletion functionality for the api/song/data HTTP endpoint.
When a song is deleted using this endpoint it also deletes the song attribute record for the song.
If the Directory that the song is stored in is empty after deletion, delete the directory as well.
Related to
#17