levelHidden should call super.levelHidden.
Add extra methods to query the current view and projection matrix of the camera ( issue #15)
level must be able to get the current camera for the editor (linked to #15)
Class that stores the view and projection matrix of a camera (linked to issue #15)
Uses cameraframe object to store the location of the camera (linked to issue #15)
Uses cameraframe object to restore the last transformation of the camera (linked to issue #15)