added ff/rewind & make album art load just bytes instead of writing to a file

SubSonic.py

@@ -386,6 +386,16 @@ class SubpyConn:
         with open(path if path else 'cover.png', 'wb') as file:
             file.write(r.content)
 
+    def getCoverArtRaw(self, cover_art_id: str) -> bytes:
+        url = self.base_url + '/rest/getCoverArt?'
+
+        payload = self._getBasePayload()
+        payload['id'] = cover_art_id
+
+        r = requests.get(url + self._encodePayload(payload))
+
+        return r.content
+
     def getSong(self, song_id: str) -> Song:
         url = self.base_url + '/rest/getSong?'