Update of libjitsi and its dependencies
Remove the custom CaptureDevice ivffile,greyfading,rtpdump because they were
merged into libjitsi (libjitsi.jar of the commit before contains them).

Also remove the registration of these CaptureDevice from Hammer.init because,
well, they aren't here anymore.
Forgot to free the ICE Agent before closing the MediaStream
Disable the logging of org.jitsi.impl.neomedia.transform.dtls.DatagramTransportImpl
when stopping the hammer, because when DTLS doesn't like to be closed it seems.
(re-enable the logging after the stop)