Fix Unity 5.3 script compatibility

Author: lawwong

Assets/HTC.UnityPlugin/LiteCoroutine/Examples/LiteCoroutineExample.cs

@@ -1,4 +1,6 @@
 //========= Copyright 2016-2021, HTC Corporation. All rights reserved. ===========
+#pragma warning disable 0649
+#pragma warning disable 0168
 
 using System.Collections;
 using UnityEngine;

Assets/HTC.UnityPlugin/LiteCoroutine/Examples/LiteTaskExample.cs

@@ -1,4 +1,6 @@
 //========= Copyright 2016-2021, HTC Corporation. All rights reserved. ===========
+#pragma warning disable 0649
+#pragma warning disable 0168
 
 using System;
 using System.Collections;

Assets/HTC.UnityPlugin/Utility/Container/EnumArray.cs

@@ -369,7 +369,7 @@ static EnumArrayBase()
             }
 
             // find out min/max/length value in defined enum values
-            var fields = StaticEnumType.GetFields().Where(WithoutInvalidIndexAttr).OrderBy(CompareMetadataToken).ToArray();
+            var fields = StaticEnumType.GetFields().Where(WithoutInvalidIndexAttr).OrderBy((Func<FieldInfo, int>)CompareMetadataToken).ToArray();
             var fieldEnums = new TEnum[fields.Length];
             var fieldValues = new int[fields.Length];
             var fieldNames = new string[fields.Length];

Assets/HTC.UnityPlugin/VRModule/Modules/SteamVRModule.cs

@@ -435,7 +435,7 @@ private void UpdateConnectedDevice(TrackedDevicePose_t[] poses)
                         {
                             m_openvrCtrlRoleDirty = true;
                             currState.isConnected = true;
-                            currState.deviceClass = ToVRModuleDeviceClass(vrSystem.GetTrackedDeviceClass(i));
+                            currState.deviceClass = ToVRModuleDeviceClass(vrSystem.GetTrackedDeviceClass(trackedIndex));
                             currState.serialNumber = QueryDeviceStringProperty(vrSystem, trackedIndex, ETrackedDeviceProperty.Prop_SerialNumber_String);
                             currState.modelNumber = QueryDeviceStringProperty(vrSystem, trackedIndex, ETrackedDeviceProperty.Prop_ModelNumber_String);
                             currState.renderModelName = QueryDeviceStringProperty(vrSystem, trackedIndex, ETrackedDeviceProperty.Prop_RenderModelName_String);