add orbits feature

[gilfuser]

Hi Tado.

This is a request to add orbits functionality. I hope you find it usefull.

I don't fully understand all of your code, and if you don't mind I would like to ask you about it. I'm using it as a base to later be able to livecode video with it. I have already made an experiment in the past, but I couldn't do further at the time. I'll probably try to make this addon more prompt to general use, exposing the variables. I hope I'm apt enough to it.

Thank you for your work

best regards, Gil

PS: I didn't add or changed much code, but git is showing that I changed 88% of the code. This is not true, but I don't know how to fix it.