BIG TCP Overhaul and passcode start

- Switch to Serilog for console logging
- TCPSender is now persistent (let's hope) so can be used with passcode protected workspaces
- UDP connection works with passcodes just can't timeout
- Passcode prompt is automatic for workspaces that are password protected

qController.Standard/Pages/App.xaml.cs

@@ -1,7 +1,6 @@
 using Acr.UserDialogs;
 using Xamarin.Forms;
 using Xamarin.Essentials;
-using System;
 namespace qController
 {
     public partial class App : Application
@@ -31,7 +30,6 @@ namespace qController
         public App()
         {
             InitializeComponent();
-
             /*MainPage = new NavigationPage(new QConnectionPage());
             iNav = MainPage.Navigation;*/