addRTPExtension() is called before a StreamConnector has been set, and a
NPE when an ssrc-audio-level extension is set while there is no device
session.

java.lang.NullPointerException at
org.jitsi.impl.neomedia.transform.srtp.SRTPTransformer.transform(SRTPTransformer.java:205) at
org.jitsi.impl.neomedia.transform.dtls.DtlsPacketTransformer.transform(DtlsPacketTransformer.java:1227) at
org.jitsi.impl.neomedia.transform.SinglePacketTransformer.transform(SinglePacketTransformer.java:84) at
org.jitsi.impl.neomedia.transform.TransformEngineChain$PacketTransformerChain.transform(TransformEngineChain.java:293) at
org.jitsi.impl.neomedia.transform.TransformUDPOutputStream.createRawPacket(TransformUDPOutputStream.java:67) at
org.jitsi.impl.neomedia.RTPConnectorOutputStream.write(RTPConnectorOutputStream.java:423) at
org.jitsi.impl.neomedia.rtp.translator.OutputDataStreamImpl.doWrite(OutputDataStreamImpl.java:201) at
org.jitsi.impl.neomedia.rtp.translator.OutputDataStreamImpl.run(OutputDataStreamImpl.java:344) at
java.lang.Thread.run(Thread.java:745)

Updates the JNA library to version 4.1.0 because it is dual-licensed under LGPL 2.1 and Apache License 2.0.

Moves the FFmpeg and G722 JNI libraries from libjitsi to jitsi-lgpl-dependencies because they statically link to LGPL objects.

- Creates an AbstractRTCPTerminationStrategy that takes care of all the
  boilerplate code for RTCP termination strategies and shall serve as a
  base for all RTCP termination strategies. This newly introduced class
  acts an RTCP compound packet transform chain. Inheritors can add
  transformers to that chain and generate RTCP reports.
- Moves the receiver feedback filtering functionality from the
  BasicRTCPTerminationStrategy into a new ReceiverFeedbackFilter class
  (a specialized RTCP compound packet transformer) so that it can be
  reused more easily.
- Moves the feedback cache updating functionality from the
  BasicRTCPTerminationStrategy into a new FeedbackCacheUpdater class (a
  specialized RTCP compound packet transformer) so that it can be reused
  more easily.
- Merges the ReceiverReporting class into BasicRTCPTerminationStrategy.
- Refactors the BasicRTCPTerminationStrategy and the
  HighestQualityRTCPTerminationStrategy as specializations of the
  AbstractRTCPTerminationStrategy.

blocking if we try to send too much through a TCP socket.

Removes a restriction on the use of PulseAudio devices based on a particular sample format reported by GitHub user agh1467. Removes "superflous" source code reported by "Matt" in the comments of GitHub pull request #36 "Remove condition for S16LE sample format".

This prevents any device registered as a different format from
showing up in the device list.