Move IDelayedInitializationModule back into EditorXR

Runtime/Scripts/Core/Interfaces/IDelayedInitializationModule.cs

@@ -0,0 +1,30 @@
+using Unity.Labs.ModuleLoader;
+
+namespace Unity.Labs.EditorXR
+{
+    /// <summary>
+    /// Adds Initialize and Shutdown methods to modules for when editing starts and stops
+    /// </summary>
+    public interface IDelayedInitializationModule : IModule
+    {
+        /// <summary>
+        /// Called when editing starts
+        /// </summary>
+        void Initialize();
+
+        /// <summary>
+        /// Called when editing stops
+        /// </summary>
+        void Shutdown();
+
+        /// <summary>
+        /// Used to sort delayed initialization modules before calling Initialize
+        /// </summary>
+        int initializationOrder { get; }
+
+        /// <summary>
+        /// Used to sort delayed initialization modules before calling Shutdown
+        /// </summary>
+        int shutdownOrder { get; }
+    }
+}

Runtime/Scripts/Modules/SerializedPreferencesModule.cs

@@ -2,7 +2,6 @@
 using System.Collections.Generic;
 using System.Linq;
 using Unity.Labs.EditorXR.Core;
-using Unity.Labs.ModuleLoader;
 using UnityEditor;
 using UnityEngine;