Add option to revert previous changes to windows defaults

Scripts/Helpers/GetUndoFeatureForParam.ps1

@@ -0,0 +1,17 @@
+# Returns the feature metadata for a parameter when it supports undo; otherwise returns $null.
+function GetUndoFeatureForParam {
+    param (
+        [string]$paramKey
+    )
+
+    if (-not $script:Features -or -not $script:Features.ContainsKey($paramKey)) {
+        return $null
+    }
+
+    $feature = $script:Features[$paramKey]
+    if (-not ($feature.RegistryUndoKey -and $feature.UndoAction)) {
+        return $null
+    }
+
+    return $feature
+}