Moving Stuff Around and Calling it Progress

• Internal restructuring (moving functionally similar functions together)
  • TODO: Create generic functions for both movie and show functions to reduce duplicate code
• Add extended param to trakt.user.watchlist
• Improve consistency between trakt.user.watched and trakt.user.collection
  • Rename slug to id.slug
  • Ensure proper datetime conversion
• Fix error in trakt.user.watchlist when type = shows was ignored by accident