Consider switching away from GitPython

[tarkatronic]

Feature Request

Is your feature request related to a problem? Please describe.

GitPython is "in maintenance mode", and has no active development or even active bugfixing. It does not play well with Windows. And it's actually mostly a wrapper around the git command line application. Which seems... strange.

Describe the solution you'd like

I would like to see us move away from using GitPython, with the hopes of adding first-class Windows support and improving some of the performance of this application.

Describe alternatives you've considered

One option is for us to take over maintenance of GitPython. Honestly, that's just not realistic. So let's scratch that one immediately.

A larger discussion around this can be found in the dvc project. A lot of good information on the topic can be found in that thread, along with two alternatives:

• pygit2
• dulwich

I am leaning toward dulwich at the moment. It's pure Python, and looks a little higher level than pygit2. In general I'm okay with low level APIs, but it seems to me that pygit2 is just a bit too low level/primitive. For example, this is how you clone a repo over SSH. I would rather not have to get that far into the weeds.

Teachability, Documentation, Adoption, Migration Strategy

This change should be transparent to the user, with the only changes being actual Windows support and hopefully improved performance.

[tarkatronic]

Fixed in #233