Initial support for "Copy to device" in a podcast section

For now this pull request have all the functionality that I use, in future I will add:
-podcast files sometimes need a correct tags and setting them according a PodcastEpisode info should be sufficient

Code should be in line with coding guidelines?

I have made some minor usability changes in podcast section, some might feel a bit weird at first.
Changes in Organise and OrganiseDialog should be compatible with the rest of the code.