- Linting (ESLint): Stricter rules (or switch to warning)

- Breaking internal API change: `updateGripCursor` moved to be class method of Selector rather than instance method
- Breaking internal API change: `subpathIsClosed` moved to be class method of `Path` rather than instance method
- Refactoring: Reuse utilities base64 encoder for SVG icons plugin
- Docs (JSDoc): Fix return of the `mouseUp` (can also be an object) and `mouseDown` (may also be a boolean) of `pathActions`; other JSDoc additions/improvements

editor/spinbtn/jQuery.SpinButton.js

@@ -73,7 +73,7 @@
  * @param {external:jQuery} $ The jQuery object to which to add the plug-in
  * @returns {external:jQuery}
 */
-export default function ($) {
+export default function jQueryPluginSpinButton ($) {
   if (!$.loadingStylesheets) {
     $.loadingStylesheets = [];
   }