avoid VS17 compiler warning

C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\VC\Tools\MSVC\14.12.25827\include\algorithm(1007): warning C4244: '=': conversion from 'int' to 'wchar_t', possible loss of data (compiling source file ..\..\..\Common\Ccpp\Common.cpp) [C:\projects\npp-hexedit\HexEditor\projects\2003\HexEditor.vcxproj]
         C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\VC\Tools\MSVC\14.12.25827\include\algorithm(1020): note: see reference to function template instantiation '_OutIt std::_Transform_no_deprecate<_InIt,_OutIt,int(__cdecl *)(int)>(_InIt,_InIt,_OutIt,_Fn)' being compiled
                 with
                 [
                     _OutIt=std::_String_iterator<std::_String_val<std::_Simple_types<wchar_t>>>,
                     _InIt=std::_String_iterator<std::_String_val<std::_Simple_types<wchar_t>>>,
                     _Fn=int (__cdecl *)(int)
                 ] (compiling source file ..\..\..\Common\Ccpp\Common.cpp)
         ..\..\..\Common\Ccpp\Common.cpp(769): note: see reference to function template instantiation '_OutIt std::transform<std::_String_iterator<std::_String_val<std::_Simple_types<_Ty>>>,std::_String_iterator<std::_String_val<std::_Simple_types<_Ty>>>,int(__cdecl *)(int)>(_InIt,_InIt,_OutIt,_Fn)' being compiled
                 with
                 [
                     _OutIt=std::_String_iterator<std::_String_val<std::_Simple_types<wchar_t>>>,
                     _Ty=wchar_t,
                     _InIt=std::_String_iterator<std::_String_val<std::_Simple_types<wchar_t>>>,
                     _Fn=int (__cdecl *)(int)
                 ]

Author: chcg

Common/Ccpp/Common.cpp

@@ -766,7 +766,7 @@ COLORREF getCtrlBgColor(HWND hWnd)
 
 generic_string stringToUpper(generic_string strToConvert)
 {
-    std::transform(strToConvert.begin(), strToConvert.end(), strToConvert.begin(), ::toupper);
+    std::transform(strToConvert.begin(), strToConvert.end(), strToConvert.begin(), [](TCHAR ch) { return static_cast<TCHAR>(_totupper(ch)); });
     return strToConvert;
 }