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.

{
    
    static const std::set<std::string> available_sections{
        CBaseChainParams::REGTEST,
        CBaseChainParams::TESTNET,
        CBaseChainParams::MAIN
    };
    LOCK(cs_args);
    std::list<SectionInfo> unrecognized = m_config_sections;
    unrecognized.remove_if([](const SectionInfo& appeared){ return available_sections.find(appeared.m_name) != available_sections.end(); });
    return unrecognized;
}
void ArgsManager::SelectConfigNetwork(const std::string& network)