Fix warnings for multi-byte character conversions

[michab66]

Warnings remain in mod_util.hpp transfrom functions:

// C4996 'std::codecvt_utf8<wchar_t,1114111,(std::codecvt_mode)0>': warning STL4017 : std::wbuffer_convert, std::wstring_convert, and the <codecvt> header(containing std::codecvt_mode, std::codecvt_utf8, std::codecvt_utf16, and std::codecvt_utf8_utf16) are deprecated in C++17. (The std::codecvt class template is NOT deprecated.) The C++ Standard doesn't provide equivalent non-deprecated functionality; consider using MultiByteToWideChar() and WideCharToMultiByte() from <Windows.h> instead. You can define _SILENCE_CXX17_CODECVT_HEADER_DEPRECATION_WARNING or _SILENCE_ALL_CXX17_DEPRECATION_WARNINGS to acknowledge that you have received this warning.	jlgen	github\jlaunch\jlgen\mod_util.hpp

Fix, follow the hint in the warning.