Interactive rebase

**Is your feature request related to a problem? Please describe.**
I'm also using Fork, and the sudden change of policy doesn't really suit me so I was looking for an alternative. The feature I use the most was interactive rebase so here is my feature request :)

**Describe the solution you'd like**
Ability to have a list of commit that I can act upon (squash, reword etc…)

**Describe alternatives you've considered**
I'm not really good at git CLI, always used a UI so if gitui could become a fully featured Git UI, that would be awesome.

The issue names no file, test, or entry point. Start by locating gitui’s existing commit-list UI and Git integration, then compare the requested squash and reword actions with Git’s interactive rebase behavior; done means users can select commits and perform those actions through the terminal UI.

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