Replace number formatting code

[drewnoakes]

This number formatting method seems a bit wild.

metadata-extractor/Source/com/drew/metadata/icc/IccDescriptor.java

Lines 227 to 246 in b19ac06

	@NotNull
	public static String formatDoubleAsString(double value, int precision, boolean zeroes)
	{
	if (precision < 1)
	return "" + Math.round(value);
	long intPart = Math.abs((long)value);
	long rest = (int)Math.round((Math.abs(value) - intPart) * Math.pow(10, precision));
	long restKept = rest;
	String res = "";
	byte cour;
	for (int i = precision; i > 0; i--) {
	cour = (byte)(Math.abs(rest % 10));
	rest /= 10;
	if (res.length() > 0 || zeroes || cour != 0 || i == 1)
	res = cour + res;
	}
	intPart += rest;
	boolean isNegative = ((value < 0) && (intPart != 0 || restKept != 0));
	return (isNegative ? "-" : "") + intPart + "." + res;
	}

In the .NET library, the equivalent code was standing out as a performance issue in traces.

drewnoakes/metadata-extractor-dotnet#403

We should find a suitable replacement. Ideally something built-in.