Heavy instancing work

Added InstanceRootCommand for blocking instance based commands if no
instance is chosen
CLI now prints the service version
Added service level CLI commands
Fixed Service.LockLoggingID
Added InstanceMetadata DataContract
Implemented Service.ListInstances
ExitCode is now set to int parent type
Fixed ConnectivityLevel flags
Optimized channel closing during instance switching

TGCommandLine/InstanceRootCommand.cs

@@ -0,0 +1,33 @@
+using System.Collections.Generic;
+using TGServiceInterface;
+
+namespace TGCommandLine
+{
+	abstract class InstanceRootCommand : RootCommand
+	{
+		public static Interface currentInterface;
+		public override ExitCode DoRun(IList<string> parameters)
+		{
+			if (currentInterface.InstanceName == null)
+			{
+				OutputProc("Missing instance!");
+				return ExitCode.BadCommand;
+			}
+			else
+			{
+				var res = currentInterface.ConnectToInstance();
+				if (!res.HasFlag(ConnectivityLevel.Connected))
+				{
+					OutputProc("Unable to connect to instance!");
+					return ExitCode.ConnectionError;
+				}
+				else if (!res.HasFlag(ConnectivityLevel.Authenticated))
+				{
+					OutputProc("The current user is not authorized to use this instance!");
+					return ExitCode.ConnectionError;
+				}
+			}
+			return base.DoRun(parameters);
+		}
+	}
+}