Major rework

[hikaru-y]

• [x] support Anki 2.1.50+
  • scoped PyQt enums

  • 6

• [x] display the inspector side-by-side or stacked vertically with the webview within a sub-window, such as the editor or card layout dialog

  • 1

  • 5

  • [x] zoom
  • [x] highlight the right-clicked element

[ghost]

This is a great set of changes, and makes debugging my code-heavy card template so much easier. Thanks so much! ❤️