Improve camera/light setup

Cameras are transformed the same way as normal objects in design studio.

With just the normal transformation gizmos it is hard to setup the camera precisely.

1) It would be very helpful to be able to look through the camera that is used for the "FormView" in order to place it more easily (like mayas "look through selected" feature). This would also be helpful to place spotlights.

2) Another improvement for placing cameras and targeted lights would be to add an additional gizmo to transform the "point of view" / target