* support for applying the same settings to multiple files in single run of the wizard (just select multiple items in the playlist)
    - note: due to this, the types of some objects in the main dictionary changed from NSString to NSArray. Additionally, this code does neither run nor compile on 10.2 anymore.
    - various loops are being performed during the run of the wizard now. Please shout if this is noticeably slower on older Macs
* solved a UTF-8-issue which prevented the usage of certain files which were added to the playlist previously
* optimised the existing code here and there
* make sure that all settings are kept for a session

Thanks to zorglub for the playlist-hint :)