* Optimize internal database, make it faster and smaller.
* Make subscription feed appear (nearly) instantly and do the slow network fetches in the background.
* Use Material themed subscribe button.
* Search query text is clickable on the result.
* Fix broken compilation due to JCenter disapearance
* Show deleted/blocked channels differently, and allow to unsubscribe from them.
* Updated translations for:
  * Catalan, Malayalam, Tamil
* Translators:
  * ek387587, Rohan Kishore, Onebyone
