This enables showing preview tooltip for all imported 3D models.
Also moved the preview image handling out of the model and into
NodeInstanceView, where it fits more naturally.
Change-Id: I48135d06aa8d9313525dae618e22692563da78fd
Fixes: QDS-2807
Reviewed-by: Mahmoud Badri <mahmoud.badri@qt.io>
Reviewed-by: Thomas Hartmann <thomas.hartmann@qt.io>
Request 3D preview image for material instances from puppet
to show on tooltip.
Support for effect previews is also done, but handler for it is not
registered, as effects cannot be shared between windows due to
issue QTBUG-86616.
Also refactored the preview image support out of navigator
to make it more accessible by other components.
Change-Id: Ie08ba218f929660c2e43d39578997a5a1a883efd
Reviewed-by: Thomas Hartmann <thomas.hartmann@qt.io>
