- 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

rollup-config.config.js

@@ -33,6 +33,7 @@ window.svgEditor.modules = false;
   })
 ];
 
+/* eslint-disable import/no-anonymous-default-export */
 export default [
   {
     input: 'svgedit-config-es.js',