Support for http(s) links in _mapping.txt

src/playlist_manager.cpp

@@ -54,6 +54,9 @@ Playlist PlaylistManager::get_playlist(String rfid_id) {
 					entry.close();
 				}
 				dir.close();
+			} else if (path.startsWith("http")) {
+				Serial.printf("Adding URL %s to the list of files\n", path.c_str());
+				current_playlist.add_file(path);
 			}
 			current_playlist.sort();
 			current_rfid_tag_id = rfid_id;