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.

Start by reviewing how the bsb command is invoked and compare it with the referenced bs-loader pull request #29. Verify the platform-specific command behavior on macOS and Linux, then confirm that bsb output includes colors without breaking the existing build flow.

Written by the indexing model from the issue text.