V0.6.16 Halia

Bug Fixes:

• Add book to shelf in popup for book details working again

• Cover extraction with comicapi for webp files working now

• Added missing unique marker on comments table to prevent double book_ids in comment table

• Delete book format is working again

• Books can be added to shelf from search again

• Kobo sync token is now also created if accessed from localhost

• If book format is deleted this also deletes the "book synced to kobo" status

• Security fix: JavaScript could get executed on authors page

• Security fix: Loading cover from localhost is prevented

• Security fix: Prevent creating a public shelf without permission