Add support for fmtlib

[chiphogg]

We have a formatter internal to Aurora, which was pretty easy to write. However, I don't think it was that smart about taking the unit label length into account. Maybe we can write some test cases for an improved implementation.

[catskul]

Any chance of this being ported to the public library?

[chiphogg]

Yes, this issue tracker is only for things that we intend for the public library. 🙂 We have another internal tracker for Aurora-internal issues.

It's a very busy time at Aurora right now with our product launch imminent, so we can't work on Au much at all right now. That said, I think we could fit it in for the next release we do get a chance to do, so I'll bump it up to the 0.4.2 milestone. Thanks for asking!