When downloading and running Bitcoin core for the first time, after clicking through the "Are you sure you want to open. it?" screen, there's a possibility that macOS will pass an argument like `-psn_0_SOME_ID` to the application, which results in a shutdown as it's an invalid argument:

![v0 19 0rc1 args shutdown](https://user-images.githubusercontent.com/863730/67034964-b026fc00-f0e6-11e9-8462-70d0fcf613e6.png)

This only happens on the first run, subsequent opens will work fine, but we should filter these out, otherwise it's a poor and confusing first experience.

{
    assert(key[0] == '-');
    size_t option_index = key.find('.');
    if (option_index == std::string::npos) {
        option_index = 1;
    } else {
        ++option_index;
    }
    if (key.substr(option_index, 2) == "no") {
        option_index += 2;
    }
    const std::string base_arg_name = '-' + key.substr(option_index);
    LOCK(cs_args);
    for (const auto& arg_map : m_available_args) {
        const auto search = arg_map.second.find(base_arg_name);
        if (search != arg_map.second.end()) {
            return search->second.m_flags;
        }
    }
    return ArgsManager::NONE;
}
std::vector<std::string> ArgsManager::GetArgs(const std::string& strArg) const