Currently, the editor gets recreated whenever the camera options (or
several other props that are only relevant at initialisation time) get
changed.
This diff makes it so that:
- init-only props are kept in a ref so they don't invalidate the editor
(but are used when the editor _does_ get recreated)
- camera options are kept up to date in a separate effect
### Change type
- [x] `bugfix`
### Release notes
Fix an issue where changing `cameraOptions` via react would cause the
entire editor to re-render
cf32a09221