Gxformat2

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* Add experimental export to CWL 1.2 using new abstract Operation classes.

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* Drop support for Python 2 - to support next bullet.
* Update schema parser for recent changes to schema salad.

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* Added abstraction for uniform access to workflow outputs across formats.

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* Bug fixes for exporting newer input concepts from native to Format 2.
* Added abstraction for uniform access to workflow inputs across formats.

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* Rework cytoscape and helpers for reuse from Planemo.
* Rev markdown validator for and from latest Galaxy changes.

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* Bug fix for gxwf-lint invocation from setup.py installed script.

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