This is a part of #2717
Some settings didn't get getters because
- They are transient parse settings (e.g. ignore errors)
- They get propagated to args and should be checked there
`is_allow_hyphen_values_set` is a curious case. In some cases, we only
check the app and not an arg. This seems suspicious.
I have access to the `clap-man` name but we use `clap_*`. Rather than
people getting mixed up on which is supposed to use, we went with a
different name.