Change the zAutogenerated asset prefix to directory-like:

- Change the zAutogenerated__ prefix to zAutogenerated/
- This allows the zAutogenerated/ assets to display in a dedicated menu in the animation editor when the animator is selected.
- For legacy compatibility, the old prefix is still matched for the invocation of ClearPreviousAssets() in addition to the new.

Packages/dev.hai-vr.animator-as-code.v1/V1/Editor/Aac.cs

@@ -553,7 +553,12 @@ namespace AnimatorAsCode.V1
             var allSubAssets = AssetDatabase.LoadAllAssetsAtPath(AssetDatabase.GetAssetPath(_configuration.AsPersistentContainerRequired()));
             foreach (var subAsset in allSubAssets)
             {
-                if (subAsset.name.StartsWith($"zAutogenerated__{_configuration.AssetKey}__")
+                if (
+                    (
+                        subAsset.name.StartsWith($"{AacInternals.AutoGeneratedPrefix}{_configuration.AssetKey}__")
+                        || subAsset.name.StartsWith($"{AacInternals.AutoGeneratedLegacyPrefix}{_configuration.AssetKey}__")
+                    )
+                    
                     && (subAsset is AnimationClip || subAsset is BlendTree || subAsset is AvatarMask))
                 {
                     AssetDatabase.RemoveObjectFromAsset(subAsset);