Added connect and disconnect stub commands, added autocomplete to help command.

lib/ui/commands/disconnect_command.rb

@@ -0,0 +1,20 @@
+class IMICFPS
+  class Commands
+    class DisconnectCommand < Command
+      def group
+        :global
+      end
+
+      def command
+        :disconnect
+      end
+
+      def handle(arguments, console)
+      end
+
+      def usage
+        "Disconnect from currently connected server, if any."
+      end
+    end
+  end
+end