Update Log to use worker thread

OpenRA.Server/Program.cs

@@ -22,6 +22,18 @@ namespace OpenRA.Server
 	class Program
 	{
 		static void Main(string[] args)
+		{
+			try
+			{
+				Run(args);
+			}
+			finally
+			{
+				Log.Dispose();
+			}
+		}
+
+		static void Run(string[] args)
 		{
 			var arguments = new Arguments(args);