Check for various artists by checking if each track has a dash

I find it annoying when scrobbling compilations from Bandcamp that the track title contains the artist. I've made a modification to the scrobbler to work out artist from the track if either:

 - The artist is set to 'Various' or 'Various Artists' and track has a dash 
 - This is an album and all the tracks have a dash
		 
__Examples:__

- https://nothingbuthopeandpassion.bandcamp.com/album/nothing-but-nordic-music