This is a WIP of the TAP to YAML conversion for the purposes of results-reporting.
The code is in the state where all the unittests work, but I'm yet to try it on a
real-life libtaskotron run. The documentation is practically untouched so far.
But I guess this might be a good start for discussions.
Sometimes the docs/comments refer to a resultyaml format and other times, like here, it's just called YAML. I think we'd be better off being consistent about naming and sticking with the resultyaml moniker to reduce the potential for confusion with all the other places we're using YAML