HelpRequested reads the argv and returns whether it contains one of `-h`, `--help`, in any position, or `help` as the first element in the vector.

NewCommandWithSubCommands constructs a [CommandWithSubCommands].

CommandWithSubCommands is a [Command] that contains subcommands.

StandardEnvironment is the standard implementation of [Environment].

Command is an rbmk command-line command.

Environment is the environment for executing a [Command].

LazyHelpRenderer renders the help possibly adding colours and formatting.

LazyHelpRendererFunc is a function that implements [LazyHelpRenderer].