Add the availability for search in ignored files (defaults to false)

[mtarld]

It's often useful to search in vendors or ignored files.

This new button allows toggling if the search should search in ignored files.

[mtarld]

FYI, I'm kind of new in writing lisp, I'll take any advice

[PalaceChan]

@mtarld i had a similar problem (wanting the --hidden option for the rg searches) - the recommended approach (which works perfectly for me) from the author himself is here in issue 24 basically use advice:

(defun deadgrep--include-args (rg-args)
  (push "--hidden" rg-args) ;; consider hidden folders/files
  (push "--follow" rg-args) ;; follow symlink
  )

(advice-add 'deadgrep--arguments :filter-return #'deadgrep--include-args)

[mtarld]

Indeed, I wasn't aware of that workaround, I'll close it then, thanks!

[max-arnold]

I think this PR is still needed if you want the --no-ignore option on a per-search basis (i.e. not permanently unlike the advice-add)