I want the git_setup code to only have the UI. Nothing else. The cloning
process for GitJournal is very specific to GitJournal. It doesn't need
to be that complicated for other projects.
Platform from dart:io cannot be used on the web for reasons. And this
way we get a fake File/Directory class which we can use for atleast
running the web version, even if it won't work.
This way I can more easily choose if I want to use libgit2 or the git
executable or whatever. It's being done so that one can wrtie automated
tests for this cloneRemote function.
There are still some users for whom this doesn't work, and after so so
many iterations, it's time to write tests. This is just way too complex
for me without tests.
