function addLeadingZeros(iValue, iLength) {
		return (iValue < 0 ? "-" : "") + Math.abs(iValue).toString().padStart(iLength, "0");
	}
Pads the start of the absolute given value with zeros up to the given length. If the given
value is negative the leading minus is added in front of the zeros.

@param {int} iValue The value to be padded
@param {int} iLength The minimal length of the resulting string excluding the minus sign
@returns {string} The padded string