- Optimization: Re-rerun image optimization per update

- Linting (ESLint): Adjust per now applied rules
- Testing: Accessibility test API update
- Docs: Clarify need for Node.js/npm being installed
- npm: Update devDeps and core-js-bundle copy; add new axe testing peer dep. axe-core

dist/extensions/ext-imagelib.js

@@ -365,6 +365,7 @@ var svgEditorExtension_imagelib = (function () {
                             return $.process_cancel(message);
 
                           case 39:
+                            // eslint-disable-next-line require-atomic-updates
                             transferStopped = true; // Should a message be sent back to the frame?
 
                             $('#dialog_box').hide();

dist/extensions/ext-storage.js

@@ -346,6 +346,7 @@ var svgEditorExtension_storage = (function () {
                     // doesn't even want to remember their not wanting
                     // storage, so we don't set the cookie or continue on with
                     //  setting storage on beforeunload
+                    // eslint-disable-next-line require-atomic-updates
                     document.cookie = 'svgeditstore=' + encodeURIComponent(pref) + '; expires=Fri, 31 Dec 9999 23:59:59 GMT'; // 'prefsAndContent' | 'prefsOnly'
                     // If the URL was configured to always insist on a prompt, if
                     //    the user does indicate a wish to store their info, we