Use DI for config in ModelsCommand

[wimski]

Summary

I've used dependency injection for the configuration class in order to avoid Laravel's magic. This makes the code more discoverable and will help refactoring down the line.

Type of change

• Misc. change (internal, infrastructure, maintenance, etc.)

Checklist

• Add a CHANGELOG.md entry

[mfn]

Nice, LGTM!

@barryvdh 👍 from me!

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Reminds me about #756 ; I still have non-Laravel code using this and it will break but a) no problem with that, I'll just adjust and it b) I think I'm the only one out there doing that anyway ;) [j/k but probably only a low number of ppl have to do this]