Creates parameter editor manfests and resolver, updates the legacy macro editor to resolve items from here.

src/Umbraco.Core/PropertyEditors/ParameterEditorResolver.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using Umbraco.Core.Manifest;
+using Umbraco.Core.ObjectResolution;
+
+namespace Umbraco.Core.PropertyEditors
+{
+    /// <summary>
+    /// A resolver to resolve all parameter editors
+    /// </summary>
+    /// <remarks>
+    /// This resolver will contain any property editors defined in manifests as well!
+    /// </remarks>
+    internal class ParameterEditorResolver : LazyManyObjectsResolverBase<ParameterEditorResolver, ParameterEditor>
+    {
+        public ParameterEditorResolver(Func<IEnumerable<Type>> typeListProducerList)
+            : base(typeListProducerList, ObjectLifetimeScope.Application)
+        {
+        }
+
+        /// <summary>
+        /// Returns the property editors
+        /// </summary>
+        public IEnumerable<ParameterEditor> ParameterEditors
+        {
+            get { return Values.Union(ManifestBuilder.ParameterEditors); }
+        }
+
+        /// <summary>
+        /// Returns a property editor by alias
+        /// </summary>
+        /// <param name="alias"></param>
+        /// <returns></returns>
+        public ParameterEditor GetByAlias(string alias)
+        {
+            return ParameterEditors.SingleOrDefault(x => x.Alias == alias);
+        }
+    }
+}