Tweaking in the audio file's metadata.

[evertonstz]

Is your feature request related to a problem? Please describe.
I'm not sure if pcd does anything with the audio file's metadata, but a nice feature would be to update the file's metadata with the info from the RSS.

Describe the solution you'd like
If this process is already done for song name and album name (it seems to be), would also be nice to link the episode's number from the RSS with the track number in the file's metadata to help song players with ordering the episodes correctly.