Migrations from PropertyEditors folder without dependencies to DataValueEditor or ConfigurationEditor<TConfiguration>

src/Umbraco.Core/PropertyEditors/DataValueReferenceFactoryCollection.cs

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+using System.Collections.Generic;
+using Umbraco.Core.Composing;
+using Umbraco.Core.Models;
+using Umbraco.Core.Models.Editors;
+
+namespace Umbraco.Core.PropertyEditors
+{
+    public class DataValueReferenceFactoryCollection : BuilderCollectionBase<IDataValueReferenceFactory>
+    {
+        public DataValueReferenceFactoryCollection(IEnumerable<IDataValueReferenceFactory> items)
+            : base(items)
+        { }
+
+        // TODO: We could further reduce circular dependencies with PropertyEditorCollection by not having IDataValueReference implemented
+        // by property editors and instead just use the already built in IDataValueReferenceFactory and/or refactor that into a more normal collection
+
+        public IEnumerable<UmbracoEntityReference> GetAllReferences(IPropertyCollection properties, PropertyEditorCollection propertyEditors)
+        {
+            var trackedRelations = new HashSet<UmbracoEntityReference>();
+
+            foreach (var p in properties)
+            {
+                if (!propertyEditors.TryGet(p.PropertyType.PropertyEditorAlias, out var editor)) continue;
+
+                //TODO: We will need to change this once we support tracking via variants/segments
+                // for now, we are tracking values from ALL variants
+
+                foreach (var propertyVal in p.Values)
+                {
+                    var val = propertyVal.EditedValue;
+
+                    var valueEditor = editor.GetValueEditor();
+                    if (valueEditor is IDataValueReference reference)
+                    {
+                        var refs = reference.GetReferences(val);
+                        foreach (var r in refs)
+                            trackedRelations.Add(r);
+                    }
+
+                    // Loop over collection that may be add to existing property editors
+                    // implementation of GetReferences in IDataValueReference.
+                    // Allows developers to add support for references by a
+                    // package /property editor that did not implement IDataValueReference themselves
+                    foreach (var item in this)
+                    {
+                        // Check if this value reference is for this datatype/editor
+                        // Then call it's GetReferences method - to see if the value stored
+                        // in the dataeditor/property has referecnes to media/content items
+                        if (item.IsForEditor(editor))
+                        {
+                            foreach (var r in item.GetDataValueReference().GetReferences(val))
+                                trackedRelations.Add(r);
+                        }
+                    }
+                }
+            }
+
+            return trackedRelations;
+        }
+    }
+}