Implement vsnprintf

[Patryk Kubiak]

The function vsnprintf needs to be implemented according to the POSIX standard: http://www.cplusplus.com/reference/cstdio/vsnprintf/

Functions to use:

oC_ErrorCode_t   oC_KPrint_VPrintf           ( char * outBuffer , oC_UInt_t Size , oC_IoFlags_t IoFlags , const char * Format , va_list ArgumentList );

[Patryk Kubiak]

Removing component: stdio (automated comment)