Draft: Py36 features

Python36 enhancements

Leaving python 2.7 behind frees us to take advantage of the 6+ years of improvements between it and 3.6.

This MR has no functionality change, but updates the following methods:

• Takes advantage of native order-preservation in dicts, yaml. (drop oyaml for PyYAML)
• [In progress] Leverages standard library pathlib for better handling and resolution of filepaths and permissions
• Rebase setuptools to recent version (previously held back to last version supporting python2)
• unify outdir and resultsdir (as started in !85 (merged))
• utilize logging critical level for logs that result in program termination
• [TODO] massive add test coverage for all changes to certify