private void processLookAndFeelSpecificValues(Map<LafType, GThemeValueMap> customSections) {
		for (LafType lafType : customSections.keySet()) {
			GThemeValueMap map = lafDefaultsMap.computeIfAbsent(lafType, t -> new GThemeValueMap());
			map.load(customSections.get(lafType));
		}
	}
Searches for all the theme.property files and loads them into either the standard
defaults (light) map or the dark defaults map.
Ghidra/Framework/Gui/src/main/java/generic/theme/PropertyFileThemeDefaults.java