Bump base C++ requirement to C++20 #116
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This currently only includes changes about functions and types that only existed as a compatibility layer or to add features that didn't exist in C++17. Fix float/double sentinel values for Optional
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Due to various reasons, including the fact that the codebase already used plenty of C++20 features and that C++20 is now mature enough to be used in widespread applications in my opinion, I want to update fastgltf to be a C++20 library.
As this cppreference page shows all relevant compilers (not just the big-three) support next to every single C++20 feature, and have for years now. These compiler versions are now popular and widespread making upgrading to any future version of fastgltf no problem.
There's still many more changes this PR needs, mainly about upgrading various other pieces of the codebase to use C++20 features, modernizing everything. I'm particularly interested in adopting C++ ranges and concepts as much as possible. I'm mainly opening this PR as a way to get feedback and maybe catch potential issues these major changes might have caused.