Adding a description text property for a track

[Yuchen Pei]

Hello,

How about we add a description text property to tracks, something 
like the following in (defun emms-track-simple-description 
(track):

modified   emms.el
@@ -722,8 +722,10 @@ return the type and the name with a colon in 
between.
Hex-encoded characters in URLs are replaced by the decoded
character."
  (let ((type (emms-track-type track)))
-    (cond ((eq 'file type)
-           (emms-track-name track))
+    (cond ((emms-track-get track 'description)
+          (emms-track-get track 'description))
+         ((eq 'file type)
+          (emms-track-name track))
          ((eq 'url type)
           (emms-format-url-track-name (emms-track-name track)))
          (t (concat (symbol-name type)

The reason I'm proposing this is that:

1. In my only usage of emms of playing urls over http / youtube-dl 
/ sftp, I can't seem to get any descriptions of any tracks for 
display.
2. It could be used for caching descriptions and reducing work 
required to load native playlists.

WDYT?

On a side note, it would also be nice to have a description 
function that feeds back the media title obtained by media players 
like mpv, which could fix some of the description problems like 
youtube-dl.

--
Best,
Yuchen

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