[Development] Raising the minimum to C++20

[Philippe]

>So, as much as I’d like for some of the things I’m working on to be
>able to benefit from C++ 20, I’d also say that we should rather slow
>down, and only require C++20 if we have something to show for it.

C++20 makes for a more enjoyable coding experience; this human factor
should not be ruled out of the equation.
With the key to sometimes more readable code and a certain gain in
productivity.

Philippe