Fix MSVC warnings and compile errors

[helmesjo]

Problem:

• warning STL4038: The contents of <expected> are available only with C++23 or later.
• sl.cpp(15,19): error C3688: invalid literal suffix '_i'; literal operator or literal operator template 'operator ""_i' not found
• ut.cpp(93,5): error C7595: 'std::source_location::current': call to immediate function is not a constant expression
  • See reported bug here.
• std::max clashes with Windows.h max() macro.

Solution:

• Use #ifdef __cpp_lib_expected instead of __has_include(<expected>), the latter isn't reliable.
• Make sure ut.hpp is compatible with Windows.h (push & pop min & max).
• Work around bugs in MSVC.

Note that we also need #592 for the build to pass (after the rename from is_container_v to is_range_v).
Also there are still 7 of the unit tests (ut.cpp) that fails (#600) which is the case for MSVC as well.

Issue: #579

Reviewers:
@kris-jusiak

[helmesjo]

Actually, just realized that the windows compatibility test shouldn't be fixed the way I did. It should be ut.hpp that takes care of making sure it works. Will fix.

Edit: Fixed.