Enable C++ 20 standard globally

[SaschaWillems]

Description

Note: This is work-in-progress and not ready for review yet. I didn't set it to "draft", as I wanted to test CI to see where things break with C++ 20.

Refs #1201

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[SaschaWillems]

Once we merge this, I think we can remove one or two external dependencies (submodules). Right now. printing formatted messages (e.g. errors) is knda complicated and goes through our framework and two externeal dependencies. One of those is "fmt", and it seems that it's functionality is also present in the STL with C++20. So we could get rid of "fmt" and maybe also "spdlog". I don't think we need to have such a complicated setup just for logging.

[jackk18912525]

A

[SaschaWillems]

@jackk18912525: Can you please remove your spam comment and also remove yourself from the reviewers?

[SaschaWillems]

A blocker is the HCWPipe third party dependency. I can't get it to compile after updating to C++20, and updating the submodule doesn't help either (esp.a s the library is now differently named). I need help on this from someone from arm, maybe @JoseEmilio-ARM?

Submitted accidentally