OPC UA Server user interface

1. Starting/stopping the OPC UA Server
2. Displaying the operating state of the OPC UA Server
3. Setting the port of the OPC UA Server
4. Publishing/Unpublishing a global variable for OPC UA Clients
5. Adding/Deleting an OPC UA Client certificate
6. Allowing anonymous access to the OPC UA Server
7. Changing the OPC UA Server user password