serialize Directory Reference

Files
	boost_optional.hpp
	Serializers for boost::optional.
	boost_uuid.hpp
	boost::uuids::uuid serializer to any format
	common_containers.hpp
	Serializers for standard containers and optional.
	time_of_day.hpp
	utils::datetime::TimeOfDay to any format
	to.hpp
	Helper for serializers.
	variant.hpp
	Serializers for std::variant.
	write_to_stream.hpp
	Common WriteToStream functions for SAX serializers.