Feature/netcore preparation (#2072)

* Use platform detection that works on mono 4.6+

* Move to use package reference for restoring nuget packages.

* DateTimeRoutines does not have Nuget packages that support .NET Standard (and therefore .NET Core). We will have to include them for now until we can get rid of this dependency.

* Start spliting some interfaces into their own files - this will help by allowing us to split them out in the future into a seperate project so the actual implementations can stay within their respective architectures when required

* Move out common libraries

* Few more tidy up tasks to get things working with .NET Standard

* Restructure the solution layout

* Encoding work to reduce rework later on platforms without Windows codepages (or require compliance with RFC1345)

* Move folder structure around to have more natural layout of the solutions

* DI server configuration to get rid of "temporary" hack and dependency circle for serverservice

* Make all encoding consistent to match the expected encoding casing for earlier versions of mono.

src/Jackett.Common/Services/TrayLockService.cs

@@ -0,0 +1,38 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading;
+using System.Threading.Tasks;
+using Jackett.Services.Interfaces;
+
+namespace Jackett.Services
+{
+
+    public class TrayLockService : ITrayLockService
+    {
+        private readonly string EVENT_HANDLE_NAME = "JACKETT.TRAY";
+
+        private EventWaitHandle GetEventHandle()
+        {
+            return new EventWaitHandle(false, EventResetMode.ManualReset, EVENT_HANDLE_NAME); 
+        }
+
+        public void WaitForSignal()
+        {
+            if (System.Environment.OSVersion.Platform != PlatformID.Unix)
+            {
+                GetEventHandle().Reset();
+                GetEventHandle().WaitOne();
+            }
+        }
+
+        public void Signal()
+        {
+            if (System.Environment.OSVersion.Platform != PlatformID.Unix)
+            {
+                GetEventHandle().Set();
+            }
+        }
+    }
+}