Moved the zedrem user key into the token store so it's not visible in
your user preferences.
Important:
* The "zedrem"/* preferences will now be ignored (you can remove it)
* A new user key will be generated, retrieve it with the
  "Configuration:Zedrem:Get User Key" command
* To change the zedrem server to connect to, override the "zedremServer"
  preference.