Derive Macro __Config__

#[derive(__Config__)]
{
    // Attributes available to this derive:
    #[source]
    #[flatten]
    #[subcommand]
    #[config]
    #[env_prefix]
    #[clap]
    #[global_name]
    #[file]
    #[table]
    #[default_order]
    #[__debug_cmd_input__]
}