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

iOS/AppDelegate.cs

@@ -1,9 +1,6 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-
-using Foundation;
+using Foundation;
 using UIKit;
+using Serilog;
 
 namespace qController.iOS
 {
@@ -14,6 +11,8 @@ namespace qController.iOS
         {
             global::Xamarin.Forms.Forms.Init();
 
+            Log.Logger = new LoggerConfiguration().WriteTo.NSLog().MinimumLevel.Debug().CreateLogger();
+
             LoadApplication(new App());
 
             return base.FinishedLaunching(app, options);

iOS/Main.cs

@@ -1,9 +1,4 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-
-using Foundation;
-using UIKit;
+using UIKit;
 
 namespace qController.iOS
 {

iOS/packages.config

@@ -8,6 +8,8 @@
   <package id="Microsoft.Win32.Primitives" version="4.3.0" targetFramework="xamarinios10" />
   <package id="NETStandard.Library" version="2.0.3" targetFramework="xamarinios10" />
   <package id="Newtonsoft.Json" version="12.0.2" targetFramework="xamarinios10" />
+  <package id="Serilog" version="2.9.0" targetFramework="xamarinios10" />
+  <package id="Serilog.Sinks.Xamarin" version="0.2.0.64" targetFramework="xamarinios10" />
   <package id="System.AppContext" version="4.3.0" targetFramework="xamarinios10" />
   <package id="System.Collections" version="4.3.0" targetFramework="xamarinios10" />
   <package id="System.Collections.Concurrent" version="4.3.0" targetFramework="xamarinios10" />

iOS/qController.iOS.csproj

@@ -137,6 +137,12 @@
     <Reference Include="Xamarin.Essentials">
       <HintPath>..\packages\Xamarin.Essentials.1.2.0\lib\xamarinios10\Xamarin.Essentials.dll</HintPath>
     </Reference>
+    <Reference Include="Serilog">
+      <HintPath>..\packages\Serilog.2.9.0\lib\netstandard2.0\Serilog.dll</HintPath>
+    </Reference>
+    <Reference Include="Serilog.Sinks.Xamarin">
+      <HintPath>..\packages\Serilog.Sinks.Xamarin.0.2.0.64\lib\Xamarin.iOS10\Serilog.Sinks.Xamarin.dll</HintPath>
+    </Reference>
   </ItemGroup>
   <ItemGroup>
     <ImageAsset Include="Assets.xcassets\AppIcon.appiconset\Contents.json">