private static void LoadSettings()
        {
            if (_folder == null)
            {
                throw new ArgumentNullException("_folder", "Root folder not initialized!");
            }

            string file = CoreVars.GetFilePath(_folder, CoreVars.SettingsFile);

            if (!File.Exists(file))
            {
                var defaultSettings = GetDefaultSettings();
                defaultSettings.Save();
                _settings = defaultSettings;
                return;
            }

            _settings = JsonConvert.DeserializeObject <PluginSettings>(File.ReadAllText(file));
            var def = GetDefaultSettings();

            _settings.GenresTagField = _settings.GenresTagField ?? def.GenresTagField;
            _settings.MoodsTagField  = _settings.MoodsTagField ?? def.MoodsTagField;
            _settings.ThemesTagField = _settings.ThemesTagField ?? def.ThemesTagField;

            _settings.Genres = _settings.Genres ?? def.Genres;
            _settings.Moods  = _settings.Moods ?? def.Moods;
            _settings.Themes = _settings.Themes ?? def.Themes;

            _settings.Save();
        }
        public void Save()
        {
            string file            = CoreVars.GetFilePath(_folder, CoreVars.SettingsFile);
            string jsonFileContent = JsonConvert.SerializeObject(this, typeof(IPluginSettings),
                                                                 Formatting.Indented, new JsonSerializerSettings());

            File.WriteAllText(file, jsonFileContent);
        }