Lots of change in here:
- Improved UActorAnimationPlayer functionality to include looping and play speed (UI needs polish)
- Fixed actor object bindings not working in PIE. We now only store the object GUID (and an object path for a fallback), which can then be fixed up within a given context (UWorld for now).
- Added UActorAnimationInstance which is responsible for managing bindings on a UActorAnimation. UActorAnimation itself is now pretty much just a data asset.
- Levels are no longer responsible for ticking actor animations, this is now handled by the client (either AMovieSceneActor, or ticked automatically if created from a blueprint node)
[CL 2696822 by Andrew Rodham in Main branch]
