Adds new endpoint to DataTypeController to return the correct data and wires that up to angular

src/Umbraco.Web/Models/ContentEditing/DataTypeReferences.cs

@@ -0,0 +1,36 @@
+using System.Collections.Generic;
+using System.Linq;
+using System.Runtime.Serialization;
+
+namespace Umbraco.Web.Models.ContentEditing
+{
+    [DataContract(Name = "dataTypeUsages", Namespace = "")]
+    public class DataTypeReferences
+    {
+        [DataMember(Name = "documentTypes")]
+        public IEnumerable<ContentTypeReferences> DocumentTypes { get; set; } = Enumerable.Empty<ContentTypeReferences>();
+
+        [DataMember(Name = "mediaTypes")]
+        public IEnumerable<ContentTypeReferences> MediaTypes { get; set; } = Enumerable.Empty<ContentTypeReferences>();
+
+        [DataMember(Name = "memberTypes")]
+        public IEnumerable<ContentTypeReferences> MemberTypes { get; set; } = Enumerable.Empty<ContentTypeReferences>();
+
+        [DataContract(Name = "contentType", Namespace = "")]
+        public class ContentTypeReferences : EntityBasic
+        {
+            [DataMember(Name = "properties")]
+            public object Properties { get; set; }
+
+            [DataContract(Name = "property", Namespace = "")]
+            public class PropertyTypeReferences
+            {
+                [DataMember(Name = "name")]
+                public string Name { get; set; }
+
+                [DataMember(Name = "alias")]
+                public string Alias { get; set; }
+            }
+        }
+    }
+}