- 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/locale/lang.vi.js

@@ -206,7 +206,7 @@ export default {
     unsavedChanges: 'There are unsaved changes.',
     enterNewLinkURL: 'Enter the new hyperlink URL',
     errorLoadingSVG: 'Error: Unable to load SVG data',
-    URLloadFail: 'Unable to load from URL',
+    URLLoadFail: 'Unable to load from URL',
     retrieving: 'Retrieving \'%s\' ...',
     popupWindowBlocked: 'Popup window may be blocked by browser',
     exportNoBlur: 'Blurred elements will appear as un-blurred',