Updated Virtru encrypt client to allow the emailing of the protected file.

clientEmail.js

           const client = new Virtru.Client({email});
           const encryptParams = new Virtru.EncryptParamsBuilder()
             .withArrayBufferSource(arrayBuffer)
             .withDisplayFilename(`${docTitle}.pdf`)
             .withPolicy(policy)
             .withUsersWithAccess(authorizedUsers)
             .build();
           const ct = await client.encrypt(encryptParams);
           var ctString = await ct.toString();  // Encrypt to string rather than to file
          
           // Run server-side function to generate an email
           // to the list of authorized users and include
           // the HTML generated above as an attachment. 
           var userMessage = $('#email-body').val().replace(/\n/g, '<br/>');
                      // Take user input from a field in the sidebar and preserve line breaks
           google.script.run.sendEmail(ctString, authorizedUsers, userMessage);