Fix PonyAnimator.Finish to clean up sounds after animation threads stops - since Finish can be called by a different thread and concurrency issues would result.
Added a call to StartEffects in Pony.Start so that effects appear for the initial behavior.
Added a check in PonyEditor to prevent showing the ImageCentersForm if the pony had no behaviors - the form doesn't work properly if that happens.
Version to 1.45.