private int initiateLengthModifierExtension(String formatString, int i,
			FormatParsingData data) {
		String tmpLengthModifier =
			extendLengthModifier(data.getLengthModifier(), formatString.charAt(i + 1));
		if (tmpLengthModifier != null) {
			++i;
			data.setLengthModifier(tmpLengthModifier);
		}
		return i;
	}
Takes in a single String from parseFormatString's output List and converts it to
the corresponding FormatArgument(s) and populates the formatArgumentList List.
isOutputType is true when using a format string for a function that "outputs"
Strings (e.g., printf, fprintf, etc.). When it's false, it evaluates the
String's data types as if the function "inputs" Strings (e.g., scanf)

@param formatString       Format String
@param formatArgumentList   List of FormatArgument that will be written to
@param isOutputType Type of variadic function
@return True if format string successfully parsed
Ghidra/Features/DecompilerDependent/src/main/java/ghidra/app/plugin/core/string/variadic/FormatStringParser.java