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.

{
    std::vector<std::string> result = {};
    if (IsArgNegated(strArg)) return result; 
    LOCK(cs_args);
    ArgsManagerHelper::AddArgs(result, m_override_args, strArg);
    if (!m_network.empty()) {
        ArgsManagerHelper::AddArgs(result, m_config_args, ArgsManagerHelper::NetworkArg(*this, strArg));
    }
    if (ArgsManagerHelper::UseDefaultSection(*this, strArg)) {
        ArgsManagerHelper::AddArgs(result, m_config_args, strArg);
    }
    return result;
}
bool ArgsManager::IsArgSet(const std::string& strArg) const