add binary formatting (proof-of-concept)

[Pr0gm4n]

Hello there!

I wanted to suggest adding binary/octal (and potentially exponential for f32/f64) formatting support for numbers. As a proof-of-concept, I have adjusted the structures needed for hex-formatting to showcase that the same workflow would work with the other mentioned types. I would even expect that we could create a unified interface & macros for the definitions for the impl blocks.

Some thoughts:

• It seems that the only thing that changes is the mask (0xf vs. 0b1) and the bitshift operation, as well as some constant (e.g. the prefix would be 0b).
• More precisely, if you have a bit shift by x, then your mask is 2.pow(x) - 1 – maybe that could be used in the macro as well.
• The HexOptions struct could be renamed and reused for all those number format options, I believe.

What's your opinion on this? Are there any plans to include such functionality anyways?