private static String fromExternalId(String externalId) {
		if (externalId.startsWith(EXTERNAL_PREFIX)) {
			return externalId.substring(EXTERNAL_PREFIX.length());
		}
		if (externalId.startsWith(EXTERNAL_LAF_ID_PREFIX)) {
			return LAF_ID_PREFIX + externalId.substring(EXTERNAL_LAF_ID_PREFIX.length());
		}
		return externalId;
	}
Parses the value string into an icon or reference and creates a new IconValue using
the given key and the parse results.
@param key the key to associate the parsed value with
@param value the color value to parse
@return an IconValue with the given key and the parsed value
@throws ParseException if the value can't be parsed
Ghidra/Framework/Gui/src/main/java/generic/theme/IconValue.java