- 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

test/jQuery.attr_test.js

@@ -1,5 +1,9 @@
 /* eslint-env qunit */
 
+/* eslint-disable import/unambiguous */
+
+// Todo: Incomplete!
+
 // log function
 QUnit.log((details) => {
   if (window.console && window.console.log) {