Add button to copy sound field details to other sounds in the describe/edit form

[ffont]

The new UI allows the description and editing of multiple sounds at once (up to 10), but does not include many features to add copy data from/to the sound being edited. It would be nice to add a button to each of the fields that will copy the contents of that field to all the other sounds in the current edit/describe round. It could be similar to the button that already exists to copy the tags of a sound (or placed in a similar place but for every field).