[RFC] bmakelib - Print available Make targets and variables along w/ their docs

I'm trying to gather requirements wrt a potential bmakelib feature linked in the post.

I'd appreciate your feedback around:

• What are the conventions you follow to document your Makefiles?
• How/where do you usually declare variables and how do you document them?

Please take a second to share your thoughts on the issue or simply reply to this post if you'd prefer 🙏