Feature/autofac tidyup (#2096)

* Move service config service back into shared .NET Framework Library

* Move Content files into shared folder. Make autoface load different assembilies depending on what framework is using it.

* Change my mind on what the shared module should be called. Common Module is too bland.

* DotNet4.SocksProxy is not yet publically .NET Standard. Revert to previous SocksWebProxy package.

* Check in unstaged change to test dependency injection setup.

src/Jackett.Service/Service.cs

@@ -20,6 +20,7 @@ namespace Jackett.Service
         protected override void OnStart(string[] args)
         {
             Engine.Logger.Info("Service starting");
+            Engine.BuildContainer(new WebApi2Module());
             Engine.Server.Initalize();
             Engine.Server.Start();
             Engine.Logger.Info("Service started");