4.12.0

• Fix pasting links when targetBlank option is being used
• Fix for spellcheck option after destroy
• Fix over-reaching keyboard shortcuts for commands
• Expose new 'positionToolbar' custom event
• Add new isKey() helper in util
• Add cleanup on destroy for auto-link and placeholder extensions
• Base extension changes
  • Add getEditorElements(), getEditorId(), and getEditorOption() helpers
  • Add on(), off(), subscribe(), and execAction() helpers
  • Introduce destroy() lifecycle method + deprecate deactivate()