Update Desktop Vision to use oauth code flow
Notes:
- This PR updates Vartiste with the new Desktop Vision SDK
- Adding Desktop Vision to the scene will no longer require a redirect
- Defines the Desktop Vision version
What's new?
- The JS SDK now includes oauth code auth, enabling users to add computers to a scene without redirecting
- This means users can add a Desktop Vision computer directly to the scene without leaving webXR
- The code for implementing desktop vision is also dramatically simplified