Update all projects from C++17 to C++20 standard

[stevewgr]

Description

Update all projects from C++17 to C++20 standard.

Let's now encourage in this codebase modern C++ using:

• std::format: https://en.cppreference.com/w/cpp/utility/format/format
• std::ranges: https://en.cppreference.com/w/cpp/ranges

Of course there are many good features added with this version, so please have a look here: https://www.geeksforgeeks.org/features-of-c-20/

[xGuTeK]

Good job ;)

[stevewgr]

Build passing: https://github.com/ko4life-net/ko/actions/runs/3256080075/jobs/5346076816

Also tested everything locally. All seems to be in order.

Merging. 🚀