Function underscorize

tools/xml2cpp-codegen/generator_utils.cpp:13–24

std::string underscorize(const std::string& str)
{
    std::string res = str;
    for (unsigned int i = 0; i < res.length(); ++i)
    {
        if (!isalpha(res[i]) && !isdigit(res[i]))
        {
            res[i] = '_';
        }
    }
    return res;
}

std::string stub_name(const std::string& name)
{