Fix/4434 idle cpu - removing unused #if compile time conditionals (#4438)

* cleaned up IFDEFs for Full trust thread pool execution

* removed some more IFDEF code

* cleaned up more IFDEFs

* Revert "cleaned up more IFDEFs"

This reverts commit 1345aac.

* Revert "removed some more IFDEF code"

This reverts commit b2b9f42.

Author: Aaronontheweb

src/core/Akka/Dispatch/AbstractDispatcher.cs

@@ -218,9 +218,7 @@ private static DedicatedThreadPoolSettings ConfigureSettings(Config config)
     /// </summary>
     internal sealed class ThreadPoolExecutorServiceFactory : ExecutorServiceConfigurator
     {
-#if APPDOMAIN
         private static readonly bool IsFullTrusted = AppDomain.CurrentDomain.IsFullyTrusted;
-#endif
 
         /// <summary>
         /// TBD
@@ -229,10 +227,9 @@ internal sealed class ThreadPoolExecutorServiceFactory : ExecutorServiceConfigur
         /// <returns>TBD</returns>
         public override ExecutorService Produce(string id)
         {
-#if APPDOMAIN
             if (IsFullTrusted)
                 return new FullThreadPoolExecutorServiceImpl(id);
-#endif
+
             return new PartialTrustThreadPoolExecutorService(id);
         }
 

src/core/Akka/Dispatch/Dispatchers.cs

@@ -11,7 +11,6 @@
 using System.Threading.Tasks;
 using Akka.Actor;
 using Akka.Configuration;
-using Akka.Configuration;
 using Helios.Concurrency;
 using ConfigurationFactory = Akka.Configuration.ConfigurationFactory;
 
@@ -45,7 +44,6 @@ protected ThreadPoolExecutorService(string id) : base(id)
         }
     }
 
-#if UNSAFE_THREADING
     /// <summary>
     /// INTERNAL API
     /// </summary>
@@ -68,7 +66,6 @@ public FullThreadPoolExecutorServiceImpl(string id) : base(id)
         {
         }
     }
-#endif
 
     /// <summary>
     /// INTERNAL API