add Update History

- add Computername into DataGrid (if needed)
- add toggle for Update History
- add Update History interface
- add Update Interface Toggle Logic
- add Update scan logic
- initialize Update selected / all logic
- center specific datagrid columns

functions/public/Invoke-WPFUpdateHistoryToggle.ps1

@@ -0,0 +1,11 @@
+function Invoke-WPFUpdateHistoryToggle {
+    if ($sync["WPFShowUpdateHistory"].Content -eq "Show History") {
+        $sync["WPFShowUpdateHistory"].Content = "Show available Updates"
+        $sync["HistoryGrid"].Visibility = "Visible"
+        $sync["UpdatesGrid"].Visibility = "Collapsed"
+    } else {
+        $sync["WPFShowUpdateHistory"].Content = "Show History"
+        $sync["HistoryGrid"].Visibility = "Collapsed"
+        $sync["UpdatesGrid"].Visibility = "Visible"
+    }
+}