create client certificate

In order to create client certificates for authorisation on the server, the Supervisor user level is required in the VC1 control, which corresponds to the highest user level available for the customer.
The CommonName should be chosen after the machine name, as the certificates are then stored in a folder named like the CommonName.
The name of the organisation is appended to the certificate name as a prefix. (OrganizationOpcUaVC1Client [thumbprint].pem)
If the private key format PFX is selected, the private key is exported in .pfx format; if PEM is selected, the private key is exported as both .pfx and .pem.
The user level "Observer" corresponds to read access.
The user level "Operator" corresponds to read & write access.