Convert all CPLsprintf -> CPLvsnprintf

[Kurt Schwehr]

Using INT_MAX for a byte limited snprintf defeats the purpose of snprintf and allows for buffer overflows. Convert all CPLsprintf -> CPLvsnprintf with the proper byte counts.

int CPLsprintf(char *str, const char* fmt, ...)
{
    va_list args;

    va_start( args, fmt );
    // TODO: Danger!  Using INT_MAX allows for buffer overflows.
    int ret = CPLvsnprintf( str, INT_MAX, fmt, args );
    va_end( args );
    return ret;
}

find . -name \*.cpp | xargs grep CPLsprintf | wc -l
     144