Add option to disable MS Store app results in Windows Search (#509)

This also includes:

* Update README for DisableSearchHighlights and DisableFindMyDevice

* Extracted more logic from main script into separate scripts

* Add event handler for tab changes to regenerate overview

Scripts/Features/EnableWindowsFeature.ps1

@@ -0,0 +1,16 @@
+# Enables a Windows optional feature and pipes its output to the console
+function EnableWindowsFeature {
+    param (
+        [string]$FeatureName
+    )
+
+    $result = Invoke-NonBlocking -ScriptBlock {
+        param($name)
+        Enable-WindowsOptionalFeature -Online -FeatureName $name -All -NoRestart
+    } -ArgumentList $FeatureName
+
+    $dismResult = @($result) | Where-Object { $_ -is [Microsoft.Dism.Commands.ImageObject] }
+    if ($dismResult) {
+        Write-Host ($dismResult | Out-String).Trim()
+    }
+}