upgrade to Unity 2020

.vsconfig

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+  "version": "1.0",
+  "components": [
+    "Microsoft.VisualStudio.Workload.ManagedGame"
+  ]
+}

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Assets/Scripts/Editor/VREditorToggle.cs

-//This script allows us to easily toggle VR Supported on and off using a top level menu item. This is
-//an editor script meaning it modifies how the Unity editor actually works. This script has no effect on the
-//game project itself
-//REMEMBER: To toggle VR Supported normally, go to:
-//		Edit -> Project Settings -> Player -> Other Settings
-
-using UnityEngine;
-using UnityEditor;		//Enables the use of editor modifying code
-using UnityEngine.VR;	//Enables us to check VR settings
-
-public class VREditorToggle
-{
-	const string ONNAME = "VR/Enable VR";		//The name of our Enable menu item
-	const string OFFNAME = "VR/Disable VR";		//The name of our Disable menu item
-
-
-	//This method creates the Enable menu item. When the menu item is clicked, the code
-	//inside this method executes
-	[MenuItem(ONNAME)]
-	static void EnableVR()
-	{
-		//Turn VR Supported on
-		PlayerSettings.virtualRealitySupported = true;
-	}
-
-	//This method "validates" the Enable menu item. It is used by the editor to format
-	//the menu item for us
-	[MenuItem(ONNAME, true)]
-	static bool EnableValidate()
-	{
-		//If VR Supported is enabled, add a checkmark next to this menu item
-		Menu.SetChecked (ONNAME, PlayerSettings.virtualRealitySupported);
-		//Return the opposite of whether or not VR is supported. Thus, if VR Supported is enabled,
-		//this returns "false". The result is that if VR Support is enabled, this menu item is grayed-out
-		//and cannot be selected again
-		return !PlayerSettings.virtualRealitySupported;
-	}
-
-	//This method creates the Disable menu item. When the menu item is clicked, the code
-	//inside this method executes
-	[MenuItem(OFFNAME)]
-	static void DisableVR()
-	{
-		//Turn VR Supported off
-		PlayerSettings.virtualRealitySupported = false;
-	}
-
-	//This method "validates" the Disable menu item. It is used by the editor to format
-	//the menu item for us
-	[MenuItem(OFFNAME, true)]
-	static bool DisableValidate()
-	{
-		//If VR Supported is disabled, add a checkmark next to this menu item
-		Menu.SetChecked (OFFNAME, !PlayerSettings.virtualRealitySupported);
-		//Return the opposite of whether or not VR is supported. Thus, if VR Supported is disabled,
-		//this returns "true". The result is that if VR Support is disabled, this menu item is grayed-out
-		//and cannot be selected again
-		return PlayerSettings.virtualRealitySupported;
-	}
-}

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