- Essentially this commit registeres on default `--help` and
`-h` options to every command and execution short circuits
in presense of help options to help command.
- Add Supplier<CommandRegistration.Builder> as a bean which
can be autowired registration beans.
- Make this common bean customisable via CommandRegistrationCustomizer.
- Change StandardMethodTargetRegistrar to use supplier so that
annotated commands gets common customizations.
- Change sample commands to use supplier.
- Add new group, spring.shell.help to config props.
- Docs changes
- Fixes#582
- Fixes#585