No bsb output color

First I want to start by saying thanks for the great project and great contribution to Reason gamedev community. Thank you a lot! 🎂🎉🙌

I'm playing with different "bootstraps" and build systems around reprocessing and right now I'm trying your approach because I've felt in love with `create-react-app` in React world. I noticed that `bsb` output does not have colors. I had PR to `bsb-loader` that was fixing the same issue. It should be as easy as changing `bsb` command depending on platform. It should work without problem on macOS and Linux. Here is original PR I've done: https://github.com/reasonml-community/bs-loader/pull/29. It would be great to know what do you thing about it and if it's easy to implement.

Commencez par examiner comment la commande bsb est invoquée et comparez cela avec la pull request #29 référencée de bs-loader. Vérifiez le comportement spécifique à la plateforme de la commande sur macOS et Linux, puis confirmez que la sortie de bsb inclut des couleurs sans perturber le flux de build existant.

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