Port libfmt

[glebm]

Several of the winapi issues I filed today are coming from libfmt, a rather ubiqitous C++ library these days.

These issues happen because NXDK defines _WIN32, which makes the library assume WIN32 API support (and rightly so).

Should NXDK stop defining _WIN32? If not, should a patched libfmt be available as one of the SDK libraries?

[glebm]

I'd be happy to port it (i.e. sprinkle !defined(NXDK) throughout) if that's the right answer.

Can you please fork https://github.com/fmtlib/fmt into the XboxDev org and give me permissions for the fork?

[glebm]

I've got a branch that builds with NXDK here: https://github.com/glebm/fmt/tree/nxdk

[glebm]

We now maintain our own port here: https://github.com/diasurgical/fmt/tree/nxdk-2022-07-19

Feel free to use it from your projects