Renamed RtDataPrinter to WtRtDataPrinter and made go() method in VisitorBase overridable.

* sweble-wikitext e26af2b...ca4eae0 (1):

    commit ca4eae0e2167dccb45aeea367cf320f7cc80e924

        Renamed RtDataPrinter to WtRtDataPrinter

* utils 6aa758e...eff82a5 (1):

    commit eff82a54ca904739fae703b16381dd47022d4b86

        Made go() method in VisitorBase overridable.