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.

まず bsb コマンドがどのように呼び出されるかを確認し、参照されている bs-loader の pull request #29 と比較します。macOS と Linux でのプラットフォーム固有のコマンド動作を検証し、そのうえで bsb の出力に色が含まれ、既存のビルドフローを壊さないことを確認します。