Age-restricted tweets

Example (NSFW):
https://twitter.com/TabletKnight/status/1499083203881099264 (NSFW)
EDIT: Viewing the tweet without an account will result in this message, which has been preventing SNScrape from recording any data:
```
Age-restricted adult content. This content might not be appropriate for people under 18 years old. To view this media, you’ll need to [log in](https://twitter.com/) to Twitter. [Learn more](https://help.twitter.com/rules-and-policies/notices-on-twitter)
```

You can view the tweet as long as you're signed into an account (even a suspended one, meaning you can view them with one of those accounts that get instantly banned for not having a phone number).
Going by that, I think that SNScrape should still be able to download NSFW posts made in the future without having to resort to private/requested/developer API access, but possibly not without using the sign-in cookies of an existing user. Supporting this would also allow for the scraping of users marked as private (as long as your own account can see it), so double win I think.

It could also be possible to put a mechanism in place for automatically creating new accounts and saving those details just for scraping, but I think that kind of abuse of the service wouldn't be overlooked by Twitter.