Add effects preview to staging mode

To be able to see how your effect interacts with each other  on magic sheet would be very helpful. I was so excited when i heard about staging but disappointed when i gound out effect were not previewed in there. In film and TV its all on the fly and you wanna make sure your fixures will do what the gaffer asks before showing them. No time for dummy channels and other work arounds. Asked this 5 years ago and still no change so trying again.