Improve 3D functionality

This PR contains everything I needed to download 3D BR-Disks. The changes include:
- Using release size to determine quality as many BR-Disk releases do not have any tags in the release name
- Added a 3D tag in the renamer
- Added 3D to adding releases from the renamer.after event
- Some small fixes

Commits rearranged. I tested it for my setup and everything works. @RuudBurger It might make sense to test it a little further though ;)

I moved the spotweb password changes to a separate pull request.

Fixes #3010, #2954, #3110, #3163, #3156, #3108 and #2530