- 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

firefox-extension/content/svg-edit-overlay.js

@@ -1,3 +1,7 @@
+/**
+ * Opens the dialog with the SVG Editor.
+ * @returns {undefined}
+ */
 function startSvgEdit () { // eslint-disable-line no-unused-vars
   const url = 'chrome://svg-edit/content/editor/svg-editor.html';
   window.openDialog(url, 'SVG Editor', 'width=1024,height=700,menubar=no,toolbar=no');