* Fix issue #226 App does not open, showing a black screen. Some db records have unexpected null fields.
* Implement feature #218 Share tweet as image.
* Implement feature #232 Allow unauthenticated access like with a browser.
  What is possible to do with unauthenticated access:
  - view specific tweets (but not their threads);
  - view profiles;
  - view what is trending;
  - import subscriptions.
  What is not possible to do with unauthenticated access:
  - view search results;
  - view feed/groups timelines;
  - view tweet threads.
* Implement feature #203 View profile picture and banner.
* Implement feature #234 Ability to import specific subscriptions.
