implemented persistent sessions (not destroyed when broweser closed) – needs more work

Signed-off-by: Stephan Richter <s.richter@srsoftware.de>

de.srsoftware.oidc.web/src/main/resources/en/todo.html

@@ -16,6 +16,7 @@
                 <li>implement token refresh</li>
                 <li>Verschlüsselung im config-File</li>
                 <li>Configuration im Frontend</li>
+                <li>Process <em>quit session when browser is closed</em> input on login</li>
             </ul>
         </div>
     </body>