Corrected a test that did sometimes fail.
Moved the load/write contact store to the controller.
Added the serverAuthenticationPath to the config since it is needed for the authentication process.
Added methods to use the statusButton for connecting/disconnecting.
Added javadoc.
Added a first draft of the authentication process. It works (as proof-of-concept), but has to be improved. (Before that, an asynchronous backend for messaging has to be created.)
Cleanup.