std::codecvt_utf8_utf16 is deprecated in C++17

[visuve]

You will have to come up with an alternative way to convert between UTF-8 and UTF-16:
https://en.cppreference.com/w/cpp/locale/codecvt_utf8_utf16

You code will not compile on newer C++ compilers.

[benman64]

these aren't needed on platforms other than windows so will remove. They aren't needed for cross-platform design.