function unifyHexNotation(input) {
		if (input?.length === 4) {
			var colorShortNotationRegexp = /^#?([a-f\d])([a-f\d])([a-f\d])$/i;
			var sResult = colorShortNotationRegexp.exec(input);
			if (sResult) {
				return "#" + sResult[1] + sResult[1] + sResult[2] + sResult[2] + sResult[3] + sResult[3];
			}
		}
		return input;
	}
converts short notation hex color code to long notation
@param {string} input Color string, e.g. #abc
@returns {string} Normalized, 6-hex-digit color string, e.g. #aabbcc