GUI: Save Unity input fields across app restarts

I found that I tend to regenerate the animator on the same avatar a lot,
requiring me to re-enter the same paths and parameters over and over
again. Persist them across restarts.

* Refactor Config classes
* Use safe `get_if` instead of the exception-throwing `operator>>` when
  deserializing from YAML
* Begin sketching out Log singleton
* Put Quote() and Unquote() into their own little lib; they shouldn't
  hide inside PythonApp

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