Fixed: Use Nzb title as scene name when available

- Use Nzb title as scene name when available
- Only use file name as scene name when its highly likely that it's an actual scene name
- Don't store `DRONE` as default release group in the DB
- Clean up the db removing obviously wrong scene names


Sounds like the easiest solution. Now we either need another token for the release group or make it an option. Either are easier than explaining how an advanced pattern works.