Hey all,
I took a keen interest in this tool and decided to start implementing the C# run-time for Unity.
I've got the core data serialization/animation generalized so any C# library can use it. I let the library specific implementations be handled by external "controllers" while the generic library only holds an interface for working with the controllers.
I have an example of Unity controllers that can draw/animate debug lines.
Right now I've got the transformation timelines implemented with stepped and linear curves. Bezier curves should be coming soon. I also still need to work on the Attachment and Color timelines.
Hope I'm not stepping on any toes by diving into this. Hope it helps, cheers!