Rebase project-find-regexp on top of project-files
* lisp/progmodes/project.el (project--files-in-directory): New function. (project-files, project-find-regexp): Use it. (project--dir-ignores): New function. (project--find-regexp-in): Remove. (project--process-file-region): New function. (project--find-regexp-in-files): New function. (project-find-regexp, project-or-external-find-regexp): Use it, and project-files as well.
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