Avoid subscribing to unnecessary topics in 3d panel.

[defunctzombie]

From a slack converstation:

The 3D panel always subscribes to camera info topics even when no camera image or camera info is turned on. If a user is not visualizing any camera stuff in the 3d panel we don’t want to be streaming the camera information back to the app. Just like we don’t want to be streaming camera images or other random topics that are not being put towards visualizing the scene.

We've agreed that the 3D panel should avoid subscribing to these topics when it does not need to use them.