org.openhab.io.multimedia.Audio enhancement which enables user-selected
usage of the OS/Platform-available TTS engine. openhab.cfg now contains
an audio:ostts configuration parameter
Inclusion of new audio.xml in OSGI-INF
Merge pull request #869 from kgoderis/master

org.openhab.io.multimedia.Audio enhancement which enables user-selected usage of the OS/Platform-available TTS engine