Upgrading CXX_STANDARD to 23, then replace fmt lib with std::format and std::print

[marcin-wadolkowski]

Since C++ 23 there is a <print> header. After upgrade I think that fmt lib can be removed from list of libraries and STL functions may be used. Please let me know if I could do it or you think that this is waste of time :)

[ricab]

Hi @marcin-wadolkowski, this is a good idea, although we'd need to verify proper support on all platforms we build on. In my experience, AppleClang tends to lag behind and CMake will happily accept limited C++2y support for set(CMAKE_CXX_STANDARD 20) (or at least that used to be the case with older standards in older CMake versions).