Upgrade fmt to 11.0.2

[lhecker]

Between fmt 7.1.3 and 11.0.2 a lot has happened. wchar_t support is
now more limited and implicit conversions don't work anymore.

Furthermore, even the non-FMT_COMPILE API is now compile-time checked
and so it fails to work in our UI code which passes hstring format
strings which aren't implicitly convertible to the expected type.
fmt::runtime was introduced for this but it also fails to work for
hstring parameters. To solve this, a new RS_fmt macro was added
to abstract the added std::wstring_view casting away.

Finally, some additional changes to reduce stringstream usage
have been made, whenever format_to, etc., is available.
This mostly affects ActionArgs.cpp.

Closes #16000

Validation Steps Performed

• Compiles ✅
• Settings page opens ✅

[lhecker]

Should we hold off on this PR until after the 1.19 release?

[DHowett]

Should we hold off on this PR until after the 1.19 release?

Yup! I'll block it.

[DHowett]

I would also prefer to (as mentioned before) switch to vcpkg before introducing another copy/paste of some OSS code 😄

[zadjii-msft]

I'm moving this to draft for now to get it out of the queue.

I would also prefer to (as mentioned before) switch to vcpkg before introducing another copy/paste of some OSS code

We'd all love for vcpkg to like, be a good package manager, but that's probably not a viable reason to block this for now.

[DHowett]

Minor issue in that fmt 11 isn't in the vcpkg ports repo yet. That should be an easy fix. :)

[DHowett]

microsoft/vcpkg#39738

[lhecker]

I reviewed the entire diff again and I believe it's correct.

However, I just noticed that this contains all of my sstream --> fmt and c_str() --> string_view changes as well. Should I split them out? What do you think? 🤔

[DHowett]

However, I just noticed that this contains all of my sstream --> fmt and c_str() --> string_view changes as well. Should I split them out? What do you think? 🤔

i'm OK keeping it honestly

[carlos-zamora]

Nice! Thanks!