Add methods for managing auto restart feature

scripts/Windows/Scripts/Registry.ps1

@@ -1,6 +1,8 @@
 using namespace Microsoft.Win32;
 
 $null = New-Module {
+    $wuPolicyPath = "HKLM:\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate";
+
     function Edit-DefaultUserKey {
         param(
             [scriptblock] $Action
@@ -53,4 +55,22 @@ $null = New-Module {
     function Disable-BootMessage {
         Set-BootMessage;
     }
+
+    <#
+        .SYNOPSIS
+        Disables automatic reboots by Windows Update.
+    #>
+    function Disable-WindowsUpdateAutoRestart {
+        Set-ItemProperty "$wuPolicyPath\AU" `
+            -Name NoAutoRebootWithLoggedOnUsers `
+            -Value $Value;
+    }
+
+    <#
+        .SYNOPSIS
+        Resets the automatic reboot state.
+    #>
+    function Reset-WindowsUpdateAutoRestart {
+        Remove-Item -Recurse "$wuPolicyPath";
+    }
 }