Start to clean up Camera.py
Now Camera has a default instance
Get more demos to use the default instance of Camera
Get some more demos to use the default instance of Camera
Get even more demos to use the default instance of Camera
Get even, even more demos to use the default instance of Camera
Get yet even more demos to use the default instance of Camera
Get yet even more demos to use the default instance of Camera
Get more yet even more demos to use the default instance of Camera
Fix Earth demo to use the default instance of Camera
Fix pi3d2 demo to use the default instance of Camera
Fix RaspberryRain demo to use the default instance of Camera
Fix LoadModelObj demo to use the default instance of Camera
Fix Clouds demo to use the default instance of Camera
Fix RobotWalkabout demo to use the default instance of Camera
Probably fix ConferenceHall demo to use the default instance of Camera