Method ManySubcommands

tests/SubcommandTest.cpp:1265–1272

    CLI::App *sub4{nullptr};

    ManySubcommands() {
        app.allow_extras();
        sub1 = app.add_subcommand("sub1");
        sub2 = app.add_subcommand("sub2");
        sub3 = app.add_subcommand("sub3");
        sub4 = app.add_subcommand("sub4");
        args = {"sub1", "sub2", "sub3"};
    }

    ManySubcommands(const ManySubcommands &) = delete;
    ManySubcommands &operator=(const ManySubcommands &) = delete;