Complete UI overhaul that gives DoNext a nice, modern look.
Complete code rewrite to Kotlin and Android Jetpack, with a better architecture.

Task lists are now displayed in a navigation menu
Tasks are now ordered by priority and not cycles which were removed
All tasks can be Done or Removed instead of only the first one
Removed History page and split its features between the regular task lists and the new Recycle Bin
Today view is not a separate concept anymore and based on the tasks due date