* Implement notifications through polling (#4)
* Add settings relevant to notifications
* Add metadata for F-Droid, taking new screenshots and creating a nice feature graphic in the process (#12)
* Fix issue where class filter would not work when no letter was set
* Improve horizontal scroller behaviour
* Fix display issues when switching between files
* Partially fix a bug with last updated message (#13)
* Add hidden super secret settings (not accessable through UI)
