Have gArgs handle printing help #13190

 453 | +
 454 | +    gArgs.AddArg("-addnode=<ip>", _("Add a node to connect to and attempt to keep the connection open (see the `addnode` RPC command help for more info)"), false, OptionsCategory::CONNECTION);
 455 | +    gArgs.AddArg("-banscore=<n>", strprintf(_("Threshold for disconnecting misbehaving peers (default: %u)"), DEFAULT_BANSCORE_THRESHOLD), false, OptionsCategory::CONNECTION);
 456 | +    gArgs.AddArg("-bantime=<n>", strprintf(_("Number of seconds to keep misbehaving peers from reconnecting (default: %u)"), DEFAULT_MISBEHAVING_BANTIME), false, OptionsCategory::CONNECTION);
 457 | +    gArgs.AddArg("-bind=<addr>", _("Bind to given address and always listen on it. Use [host]:port notation for IPv6"), false, OptionsCategory::CONNECTION);
 458 | +    gArgs.AddArg("-connect=<ip>", _("Connect only to the specified node(s, false, OptionsCategory::OPTIONS)); -connect=0 disables automatic connections (the rules for this peer are the same as for -addnode)"), false, OptionsCategory::CONNECTION);

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 254 | +    void AddArg(const std::string& name, const std::string& help, const bool debug_only, const OptionsCategory& cat);
 255 | +
 256 | +    /**
 257 | +     * Get the help string
 258 | +     */
 259 | +    std::string GetHelpMessage();

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 562 | +
 563 | +    OptionsCategory last_cat = OptionsCategory::OPTIONS;
 564 | +    for (auto& arg : m_available_args) {
 565 | +        if (arg.first.first != last_cat) {
 566 | +            last_cat = arg.first.first;
 567 | +            if (last_cat == OptionsCategory::CONNECTION)

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