Eye gaze tracking disable not persisting

When removing the eye gaze in the input manager, input settings, the corresponding cursor object is deleted, while the reference sticks around. This causes issues when saving, (setting gets enabled again on scene reload, among potentially other things). Needs an update to remove game object reference entirely

Start in the Unity input manager and input settings code that removes eye gaze tracking, then trace how the cursor object and its reference are handled. Done means removing the game object reference as well as the cursor object, and confirming the disabled setting remains disabled after saving and reloading a scene.

Written by the indexing model from the issue text.