* lisp/vc/ediff-*.el: Use lexical-binding, plus misc cleanup
Re-enable lexical-binding in ediff. For that, change ediff-find-file so as not to rely on dynamic scoping in its calling convention. * lisp/vc/ediff-diff.el: Move `provide` to the end. Remove redundant :group. (ediff-exec-process): Disregard current directory. (ediff-forward-word-function): Use defvar-local. * lisp/vc/ediff-help.el (ediff-set-help-message): Use functionp. * lisp/vc/ediff-hook.el (menu-bar-ediff-misc-menu): Make a toggle, as in the XEmacs menu. * lisp/vc/ediff-init.el (ediff-defvar-local): Add `doc-string` prop. (ediff-check-version): Delete function, unused. * lisp/vc/ediff-mult.el: Move `provide` to the end. Remove redundant :groups. (ediff-dir-diffs-buffer-map): Move initialization into declaration. (ediff-meta-mode): Use define-derived-mode. (ediff-intersect-directories): Remove `comparison-func`, unused. (ediff-prepare-meta-buffer): Fix use of `startup-hooks`. * lisp/vc/ediff-ptch.el: Move `provide` to the end. * lisp/vc/ediff-util.el (ediff-add-to-history): Use add-to-history instead. * lisp/vc/ediff-vers.el (ediff-vc-internal, ediff-vc-merge-internal): Use push and closures. * lisp/vc/ediff-wind.el: Remove redundant :groups. * lisp/vc/ediff.el: Move `provide` to the end. Remove redundant :groups. (ediff--magic-file-name, ediff--startup-hook): New vars. (ediff-find-file): Change calling convention so as not to use symbols as value cells. (ediff--buffer-file-name): New function. (ediff-files-internal): Adjust to new calling convention of ediff-find-file. (ediff-directories-internal, ediff-directory-revisions-internal) (ediff-regions-internal): Use push and closures.
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