Use of deprecated std::wstring_convert

[madebr]

In 3fd/code/exceptions.cpp, std::wstring_convert is used, but that function is deprecated in c++17.

When building 3fd with MSVC2017.
Compiling fails with the following error:

C:\projects\3fd\core\exceptions.cpp(84): error C2664: 'std::basic_string<char,std::char_traits<char>,std::allocator<char>> std::wstring_convert<std::codecvt_utf8<wchar_t,1114111,0>,wchar_t,std::allocator<wchar_t>,std::allocator<char>>::to_bytes(const _Elem *,const _Elem *)': cannot convert argument 1 from 'const TCHAR *' to '_Elem' [C:\projects\3fd\build_subfolder\core\3fd-core.vcxproj]
C:\projects\3fd\core\exceptions.cpp(84): note: There is no context in which this conversion is possible
C:\projects\3fd\core\exceptions.cpp(86): error C3536: 'text': cannot be used before it is initialized [C:\projects\3fd\build_subfolder\3fd\core\3fd-core.vcxproj]
C:\projects\3fd\core\exceptions.cpp(89): error C2440: 'return': cannot convert from 'int' to 'std::basic_string<char,std::char_traits<char>,std::allocator<char>>' [C:\projects\3fd\build_subfolder\core\3fd-core.vcxproj]

[faburaya]

Hi! Last time I checked, std::wstring_convert has been deprecated but without a proposed replacement in the STL. Which is why I continue to use it. I suggest that you disable the error raised by deprecation. This error is normally accompanied by a message that indicates a macro name, which can be defined in order to suppress this error.