@Nonnull
	public Set<String> getClassesWithMappings() {
		Set<String> set = new TreeSet<>();
		set.addAll(classes.keySet());
		set.addAll(fields.keySet());
		set.addAll(methods.keySet());
		return set;
	}
@return Names of classes with mappings.
recaf-core/src/main/java/software/coley/recaf/services/mapping/IntermediateMappings.java