public static FormattedStringBuilder Bold(this FormattedStringBuilder source)
        {
            source.Append("<b>");
            source.PushToEnd("</b>");

            return(source);
        }
        public static FormattedStringBuilder Italic(this FormattedStringBuilder source)
        {
            source.Append("<i>");
            source.PushToEnd("</i>");

            return(source);
        }
        public static FormattedStringBuilder Color(this FormattedStringBuilder source, string color)
        {
            source.Append("<color=");
            source.Append(color);
            source.Append(">");

            source.PushToEnd("</color>");

            return(source);
        }
        public static FormattedStringBuilder Size(this FormattedStringBuilder source, int size)
        {
            source.Append("<size=");
            source.Append(size.ToString());
            source.Append(">");

            source.PushToEnd("</size>");

            return(source);
        }