@Override
	public boolean isExternal() {
		return !id.startsWith(COLOR_ID_PREFIX);
	}
Constructor used when the ColorValue will inherit its color from another ColorValue. The
color value field will be null.
@param id the id for this ColorValue
@param refId the id of another ColorValue that this ColorValue will inherit from
Ghidra/Framework/Gui/src/main/java/generic/theme/ColorValue.java