Function make_node

src/toml.hpp:5744–5748

	template <typename T>
	TOML_NODISCARD
	node_ptr make_node(T && val, value_flags flags = preserve_source_value_flags)
	{
		return node_ptr{ make_node_impl(static_cast<T&&>(val), flags) };
	}

	template <typename... T>
	struct emplaced_type_of_