[unity] Use IHasRendererObject

spine-unity/Assets/spine-unity/Modules/AttachmentTools/AttachmentTools.cs

@@ -623,7 +623,7 @@ namespace Spine.Unity.Modules.AttachmentTools {
 		}
 
 		static bool IsRenderable (Attachment a) {
-			return a is RegionAttachment || a is MeshAttachment;
+			return a is IHasRendererObject;
 		}
 
 		/// <summary>

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

@@ -294,7 +294,7 @@ namespace Spine {
 		}
 
 		public static bool IsRenderable (this Attachment a) {
-			return a is RegionAttachment || a is MeshAttachment;
+			return a is IHasRendererObject;
 		}
 
 		#region Transform Modes