Refactors the cross-protocol conference support.

src/org/jitsi/impl/configuration/SortedProperties.java

src/org/jitsi/impl/neomedia/MediaServiceImpl.java

src/org/jitsi/impl/neomedia/RTPTranslatorImpl.java

.../jitsi/impl/neomedia/codec/EncodingConfigurationImpl.java

src/org/jitsi/impl/neomedia/codec/audio/opus/JNIDecoder.java

src/org/jitsi/impl/neomedia/codec/audio/opus/JNIEncoder.java

...g/jitsi/service/neomedia/codec/EncodingConfiguration.java

src/org/jitsi/service/neomedia/device/MediaDevice.java

src/org/jitsi/util/StringUtils.java

src/org/jitsi/util/event/PropertyChangeNotifier.java