New: Switch to ASPNetCore Kestrel and SignalR

src/NzbDrone.Host/WebHost/Middleware/IAspNetCoreMiddleware.cs

@@ -0,0 +1,10 @@
+using Microsoft.AspNetCore.Builder;
+
+namespace Radarr.Host.Middleware
+{
+    public interface IAspNetCoreMiddleware
+    {
+        int Order { get; }
+        void Attach(IApplicationBuilder appBuilder);
+    }
+}