Improved utils.Tuple2/3 and HtmlRenderer

* sweble-wikitext 0e66d2b...9f4e269 (1):

    commit 9f4e269488409cdfa01a4dceda8cfaeeb89a7e26

        HtmlRenderer uses more callbacks to generate links

* utils 66827a1...519bd28 (1):

    commit 519bd283654bdead481b8d9c76332a5299c68751

        Made Tuple2/3 cloneable and serializable