Added ClientCount for PerformenceMonitor

Add a marker to help distinguish EP from other SV Executables
Fixed a "Failed to copy object. Source is null." introduced by last update
Uses dynamic ThreadCount instead of fixed 16
Re-Removed most PF support
Re-Parallelzed Level update and Character Update(a conflict warning will be issued

Barotrauma/BarotraumaServer/ServerSource/Program.cs

@@ -64,7 +64,7 @@ namespace Barotrauma
                 GameMain.ShouldRun = false;
             };
 #endif
-            Console.WriteLine("Barotrauma Dedicated Server " + GameMain.Version +
+            Console.WriteLine("Barotrauma Dedicated Server(EP) " + GameMain.Version +
                 " (" + AssemblyInfo.BuildString + ", branch " + AssemblyInfo.GitBranch + ", revision " + AssemblyInfo.GitRevision + ")");
             if (Console.IsOutputRedirected)
             {