Remove isomorphic-git dependency and use a Child proc

[fraxken]

We introduce isomorphic-git just for running a git clone command (that's quite a lot of packages). We probably need to replace that with a simple child proc instead

[PierreDemailly]

I think we can use scanner.from instead of clone + scanner.cwd
Wdyt @fraxken ? Am i missing something ?

[fraxken]

@PierreDemailly No because from require that the spec exist in the registry. The goal is to clone and analyze git projects with no relation to the registry.

[fraxken]

Or I'm missing something myself lol

[ErwanRaulo]

Hi, can you asssign me on that issue please?