update supported audio files in settings.py

+ add win_replace_slash function to format win path strings
+ misc

app/models.py

@@ -60,7 +60,7 @@ class Track:
         if self.artist is not None:
             artists = utils.split_artists(self.artist)
 
-            featured = utils.extract_featured_artists_from_title(self.title)
+            featured = utils.parse_feat_from_title(self.title)
             original_lower = "-".join([a.lower() for a in artists])
             artists.extend([a for a in featured if a.lower() not in original_lower])