v0.22.4 method editor

This release adds the Method and Function tabs to the Python editor in Elide. Method is possibly a bit jank right now, as it requires you to supply the initial self argument yourself, where Python development programs usually write it in for you. But at least you can write callbacks for input prompts in Elide now.

Lisien has a new dependency, astor, replacing the old astunparse, which is no longer maintained. I was going to simply use the built-in ast.unparse, but that turns out to generate slightly different code from one Python version to another.