Add custom nzb category and torrent label for anime

Add a custom nzb category and custom torrent label for anime in the config search section.
When a show is marked as anime, the custom anime nzb category/torrent label will be used when sending the nzb/torrent to the download clients.
By doing this, anime shows can be processed separately from the normal tv shows.

This fixes https://github.com/SiCKRAGETV/SickRage/issues/947