Fixed a bunch of error logging, cleaned up some mixed tabs/spaces

Removed any remaining "[CLASS(#)]" type logging, fixed up some more bad spacing.

There are large, commented out blocks of code in quite a few areas. (particularly file scanning and album art handling)  I don't want to touch these in case they will serve a purpose, but I'd recommend that Justin and Ben both take a look at the codebase and see if these comments are still necessary.