public void checkForUnresolvedReferences() {
		// attempting to get the values for all properties, will print warnings if they are unresolved
		for (ColorValue colorValue : colorMap.values()) {
			colorValue.get(this);
		}
		for (FontValue fontValue : fontMap.values()) {
			fontValue.get(this);
		}
		for (IconValue iconValue : iconMap.values()) {
			iconValue.get(this);
		}
		for (JavaPropertyValue propertyValue : propertyMap.values()) {
			propertyValue.get(this);
		}
	}
Gets the set of icon (.png, .gif) files that are used by IconValues that came from files
versus resources in the classpath. These are the icon files that need to be included when
exporting this set of values to a zip file.
@return the set of icon (.png, .gif) files that are used by IconValues that came from files
versus resources in the classpath
Ghidra/Framework/Gui/src/main/java/generic/theme/GThemeValueMap.java