Settingsv2 fix warnings (#2076)

* updating a ton of warnings.

* bunch of cleanup

* few smaller ones

* fixed naming

* reversing an oops

* adjusting json to use attribute

* more json properties

src/core/Microsoft.PowerToys.Settings.UI.Runner/Program.cs

@@ -13,7 +13,7 @@ namespace Microsoft.PowerToys.Settings.UI.Runner
         // Create an instance of the  IPC wrapper.
         private static ITwoWayIPCManager ipcmanager = new TwoWayIPCManager();
 
-        [STAThreadAttribute()]
+        [STAThread]
         public static void Main(string[] args)
         {
             using (new UI.App())