updated to Unity 2022 and switched to the MRTK unitypackage import al…

…ternative

Assets/MRTK/Core/AssemblyInfo.cs

@@ -0,0 +1,12 @@
+// Copyright (c) Microsoft Corporation.
+// Licensed under the MIT License.
+
+using System.Runtime.CompilerServices;
+
+[assembly: InternalsVisibleTo("Microsoft.MixedReality.Toolkit.Tests.EditModeTests")]
+[assembly: InternalsVisibleTo("Microsoft.MixedReality.Toolkit.Tests.PlayModeTests")]
+[assembly: System.Reflection.AssemblyVersion("2.8.3.0")]
+[assembly: System.Reflection.AssemblyFileVersion("2.8.3.0")]
+
+[assembly: System.Reflection.AssemblyProduct("Microsoft® Mixed Reality Toolkit")]
+[assembly: System.Reflection.AssemblyCopyright("Copyright © Microsoft Corporation")]

Assets/MRTK/Core/Attributes/DocLinkAttribute.cs

@@ -0,0 +1,20 @@
+// Copyright (c) Microsoft Corporation.
+// Licensed under the MIT License.
+
+using System;
+
+namespace Microsoft.MixedReality.Toolkit
+{
+    /// <summary>
+    /// Defines a documentation link for a service.
+    /// Used primarily by service inspector facades.
+    /// </summary>
+    [AttributeUsage(AttributeTargets.Class, AllowMultiple = false, Inherited = false)]
+    [Obsolete("Use HelpURLAttribute from Unity instead")]
+    public class DocLinkAttribute : Attribute
+    {
+        public DocLinkAttribute(string url) { URL = url; }
+
+        public string URL { get; private set; }
+    }
+}

Assets/MRTK/Core/Attributes/EnumFlagsAttribute.cs

@@ -0,0 +1,21 @@
+// Copyright (c) Microsoft Corporation.
+// Licensed under the MIT License.
+
+using System;
+using UnityEngine;
+
+namespace Microsoft.MixedReality.Toolkit
+{
+    /// <summary>
+    /// An attribute that allows a particular field to be rendered as multi-selectable
+    /// set of flags.
+    /// </summary>
+    /// <remarks>
+    /// From https://answers.unity.com/questions/486694/default-editor-enum-as-flags-.html
+    /// </remarks>
+    [AttributeUsage(AttributeTargets.Field)]
+    public sealed class EnumFlagsAttribute : PropertyAttribute
+    {
+        public EnumFlagsAttribute() { }
+    }
+}

Assets/MRTK/Core/Attributes/ExperimentalAttribute.cs

@@ -0,0 +1,36 @@
+// Copyright (c) Microsoft Corporation.
+// Licensed under the MIT License.
+
+using System;
+using UnityEngine;
+
+namespace Microsoft.MixedReality.Toolkit
+{
+    /// <summary>
+    /// A PropertyAttribute for showing a warning box that the tagged implementation is experimental.
+    /// </summary>
+    [AttributeUsage(AttributeTargets.Field, Inherited = true)]
+    public class ExperimentalAttribute : PropertyAttribute
+    {
+        /// <summary>
+        /// The text to display in the warning box.
+        /// </summary>
+        public string Text;
+
+        private const string defaultText = "<b><color=yellow>This is an experimental feature.</color></b>\n" +
+                                           "Parts of the MRTK appear to have a lot of value even if the details " +
+                                           "haven’t fully been fleshed out. For these types of features, we want " +
+                                           "the community to see them and get value out of them early. Because " +
+                                           "they are early in the cycle, we label them as experimental to indicate " +
+                                           "that they are still evolving, and subject to change over time.";
+
+        /// <summary>
+        /// Constructor.
+        /// </summary>
+        /// <param name="experimentalText">The experimental text to display in the warning box.</param>
+        public ExperimentalAttribute(string experimentalText = defaultText)
+        {
+            Text = experimentalText;
+        }
+    }
+}