Selection of multiple videos + add artist folder for those + tracknumbering for videos

[Wim1975]

Now you can only select one video at a time and all videos from different artists downloads in the "video" folder.
So please

1. add a subfolder with the artist name !

e.g. Videos\{Artist}\

2. Allow selection of multiple video's please

3. If the filename format is {TrackNumber} - {TrackTitle}
   Then please also add an ascending numbering when downloading.
   Now all video's download with '01' as track number (because we can only select one ?)

[yaronzz]

Now all video's download with '01' as track number (because we can only select one ?)
only one video in album

[yaronzz]

fixed