Use correct C++11 definition for vsprintf_s

[ChristophHaag]

defining it to sprintf actually segfaults in a release build. vsnprintf is the correct C++11 equivalent.

[ChristophHaag]

Uhm, updated because it's vsprintf() and not vsnprintf().

[heftig]

It should be vsnprintf.

int vsprintf_s(char *buffer, size_t numberOfElements, const char *format, va_list argptr);
int vsnprintf(char *restrict str, size_t size, const char *restrict format, va_list ap);

[heftig]

Also stricmp and _stricmp should probably be strcasecmp, not just strcmp.