Save use-ignore setting on ivy-resume

[CeleritasCelery]

Currently ivy-resume does not respect ivy-use-ignore. If you toggle the ignore setting, then quit the ivy session and try to resume, it will reset to ivy-use-ignore-default. This PR will save the use-ignore setting with the state, so it will be resumed as expected.

[abo-abo]

Thanks. But could you please re-work it a little? Instead of adding a new argument to ivy-read, we can just let-bind ivy-use-ignore-default in ivy-resume. Exactly how we do it with default-directory.

[CeleritasCelery]

Good feedback that simplified this change. Let me know what you think.

[abo-abo]

Thanks. Looks like we can deprecate ivy-use-ignore, since (ivy-state-ignore ivy-last) now stores the same value.

[CeleritasCelery]

I thought about doing that, but I saw that some counsel functions were using ivy-use-ignore and assumed that other external functions may as well.

[abo-abo]

Yes, I noticed that as well. I try to adhere to a deprecation workflow:

;; git shows it's deprecated on 2018-10-11
(define-obsolete-variable-alias 'counsel-more-chars-alist 'ivy-more-chars-alist "0.10.0")

After deprecation, using this variable either in config or a package results in a warning. So I think it's fine to remove even the deprecated alias after a year.