[Pull request] Animation.PlayAsObservable

[MartinGonzalez]

I've created an extension method for the legacy Animation clips when you hit Play. Under the hood it creates an AniamtionEvent at the end of the AnimationClip.

Do you think this is useful to create a pull request?

What are your thoughts?

Example code:

  animation
            .PlayAsObservable("Anim01")
            .SelectMany(_ => animation.PlayAsObservable("Anim02"))
            .SelectMany(_ => animation.PlayAsObservable("Anim03"))
            .SelectMany(_ => animation.PlayAsObservable("Anim04"))
            .Subscribe();