common/playlist: store normalized playlist filenames

This normalizes the playlist/N/filename sub-property, making it
consistent with path. As a consequence playlist-path and stream-path are
also normalized.

This will allow simplifying the code by not normalizing playlist
filenames in several places, similar to 23b57e9 for tracks.

Author: guidocella

common/playlist.c

@@ -31,7 +31,8 @@ struct playlist_entry *playlist_entry_new(const char *filename)
 {
     struct playlist_entry *e = talloc_zero(NULL, struct playlist_entry);
     char *local_filename = mp_file_url_to_filename(e, bstr0(filename));
-    e->filename = local_filename ? local_filename : talloc_strdup(e, filename);
+    e->filename = mp_normalize_path(e, local_filename ? local_filename : filename);
+    talloc_free(local_filename);
     e->stream_flags = STREAM_ORIGIN_DIRECT;
     e->original_index = -1;
     return e;