autosave function
Creates a save and writes it to the unique file.
Implementation
Future<void> autosave(SaveData saveData, String savePath) async {
final savePath_ = await _getAutoSavePath(savePath);
final saveFile = await File(savePath_).create(recursive: true);
final data = {
'scene_id': saveData.sceneId,
'description': 'autosave_${DateTime.now()}',
'state': saveData.state
};
await saveFile.writeAsString(jsonEncode(data));
}