private DownloadManager(MangaSettings a_manga_settings, string a_settings_dir)
        {
            SettingsDir = a_settings_dir;
            MangaSettings = a_manga_settings;
            Bookmarks = new Bookmarks();
            Downloadings = new Downloading();

            HtmlWeb.UserAgent_Actual = a_manga_settings.UserAgent;
        }
        private DownloadManager(MangaSettings a_manga_settings, string a_settings_dir)
        {
            SettingsDir   = a_settings_dir;
            MangaSettings = a_manga_settings;
            Bookmarks     = new Bookmarks();
            Downloadings  = new Downloading();

            HtmlWeb.UserAgent_Actual = a_manga_settings.UserAgent;
        }