deluge plugin: Ability to rename all files and rearrange directory

With these changes, all files within a torrent (not just the “main” file) can be renamed. This is mostly useful for season packs. Series parsing has been included if the needed fields are not already in the entry. The containing folder for a torrent (if present) can also be renamed using a template that renders entry fields.

Proposed wiki documentation changes can be found [here](https://github.com/tubedogg/.flexget/blob/master/plugins/Wiki-deluge_update.txt) that describe the new settings available and provide examples.