First attempt to add scala support

src/main/java/uk/yermak/audiobookconverter/ArtWork.java

src/main/java/uk/yermak/audiobookconverter/ArtWorkBean.java

src/main/java/uk/yermak/audiobookconverter/ArtWorkImage.java

...main/java/uk/yermak/audiobookconverter/AudioBookInfo.java

src/main/java/uk/yermak/audiobookconverter/MediaInfo.java

...main/java/uk/yermak/audiobookconverter/MediaInfoBean.java

...ain/java/uk/yermak/audiobookconverter/MediaInfoProxy.java

...n/java/uk/yermak/audiobookconverter/MetadataBuilder1.java

...n/java/uk/yermak/audiobookconverter/ProgressCallback.java

src/main/java/uk/yermak/audiobookconverter/Refreshable.java

src/main/java/uk/yermak/audiobookconverter/Version.java

src/main/scala/uk/yermak/audiobookconverter/ArtWork.scala

...main/scala/uk/yermak/audiobookconverter/ArtWorkBean.scala

...ain/scala/uk/yermak/audiobookconverter/ArtWorkImage.scala

...in/scala/uk/yermak/audiobookconverter/AudioBookInfo.scala

src/main/scala/uk/yermak/audiobookconverter/MediaInfo.scala

...in/scala/uk/yermak/audiobookconverter/MediaInfoBean.scala

...n/scala/uk/yermak/audiobookconverter/MediaInfoProxy.scala

.../scala/uk/yermak/audiobookconverter/MetadataBuilder.scala

...scala/uk/yermak/audiobookconverter/ProgressCallback.scala