Gxformat2

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* More cwl style inputs, initial work on conversion from native workflows, various small fixes and tweaks.

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* Bring in latest Galaxy updates - Python 3 fixes, safe YAML usage, and more PJA implemented.

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* Fix one Python 3 incompatibility.

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* Initial version - code from Galaxy's test framework with changes
based on planemo testing.

.. github_links
.. _Pull Request 99: https://github.com/galaxyproject/gxformat2/pull/99
.. _Pull Request 98: https://github.com/galaxyproject/gxformat2/pull/98
.. _Pull Request 96: https://github.com/galaxyproject/gxformat2/pull/96
.. _Pull Request 94: https://github.com/galaxyproject/gxformat2/pull/94
.. _Pull Request 95: https://github.com/galaxyproject/gxformat2/pull/95
.. _Pull Request 92: https://github.com/galaxyproject/gxformat2/pull/92
.. _Pull Request 90: https://github.com/galaxyproject/gxformat2/pull/90
.. _mvdbeek: https://github.com/mvdbeek
.. _mr-c: https://github.com/mr-c
.. _nsoranzo: https://github.com/nsoranzo
.. _jmchilton: https://github.com/jmchilton