Add registry backup & restore (#566)

Starting from this commit, Win11Debloat will automatically create a registry backup every time the script is run. This registry backup can be used to revert any registry changes made by the script.

Scripts/Helpers/RegistryPathHelpers.ps1

@@ -0,0 +1,44 @@
+function Split-RegistryPath {
+    param(
+        [Parameter(Mandatory)]
+        [string]$path
+    )
+
+    if ($path -notmatch '^(?<hive>HKEY_[^\\]+)(?:\\(?<subKey>.*))?$') {
+        return $null
+    }
+
+    return [PSCustomObject]@{
+        Hive = $matches.hive
+        SubKey = $matches.subKey
+    }
+}
+
+function Get-RegistryRootKey {
+    param(
+        [Parameter(Mandatory)]
+        [string]$hiveName
+    )
+
+    switch ($hiveName.ToUpperInvariant()) {
+        'HKEY_CURRENT_USER' { return [Microsoft.Win32.Registry]::CurrentUser }
+        'HKEY_LOCAL_MACHINE' { return [Microsoft.Win32.Registry]::LocalMachine }
+        'HKEY_CLASSES_ROOT' { return [Microsoft.Win32.Registry]::ClassesRoot }
+        'HKEY_USERS' { return [Microsoft.Win32.Registry]::Users }
+        'HKEY_CURRENT_CONFIG' { return [Microsoft.Win32.Registry]::CurrentConfig }
+        default { return $null }
+    }
+}
+
+function Get-RegistryFilePathForFeature {
+    param(
+        [Parameter(Mandatory)]
+        $Feature
+    )
+
+    if ($script:Params.ContainsKey('Sysprep') -or $script:Params.ContainsKey('User')) {
+        return Join-Path (Join-Path $script:RegfilesPath 'Sysprep') $Feature.RegistryKey
+    }
+
+    return Join-Path $script:RegfilesPath $Feature.RegistryKey
+}