First comes std stuff
Second is external crates
Then we have own modules
All in alphabetical order and as few lines as possible if readability is
preserved.
We need the module in the subcommand for building file paths and so on.
To be able to pass it, we must remove the ::new() function from the
trait, so we can make the parameter a trait object.
This is no object, as the module gets build non-generically from the
main(), so everything is fine with this.
