Implement OAuth for more shenanigans

[Koopzington]

If users of the toolkit could use AniList's OAuth new opportunities would open up like:

• Fetch data from the API which is limited to "authenticated user" like retrieving MediaList status of users they are following.
• Automatically create/update challenge posts
• Custom list management
  • creating lists from media entries found in forum posts
  • adding checkboxes to the table for selecting multiple anime and adding/moving them to lists
• Other Mutations
• Parse challenge posts and add notes to MediaList entries (e.g. "<challenge_name>.req.")
• Media entries marked as Private can be retrieved from the API