Improve dragging scene into 3D viewport

* When there's nothing to collide with:
    * Place the new scene on XZ plane when possible.
    * When the camera does not point toward the XZ plane or the
      intersection is too far away, place the new scene on a plane that
      is in front of the camera and parallel to the frame.
* Fixes positioning when in orthogonal view.
    * Place on physical collision point or the XZ plane when possible.
    * Otherwise, place it on the plane in front of the camera as if the
      camera was perspective.
* Makes use of snap settings when placing the new scene.

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