[unity] Ported AnimationState and Animation changes, references in spine-unity. See #1303.

spine-unity/Assets/Spine/Runtime/spine-unity/SkeletonExtensions.cs

@@ -507,7 +507,7 @@ namespace Spine {
 				skeleton.slots.Items[i].SetColorToSetupPose();
 				break;
 			case TimelineType.Deform:
-				skeleton.slots.Items[i].attachmentVertices.Clear();
+				skeleton.slots.Items[i].Deform.Clear();
 				break;
 			
 			// Skeleton