 - Implement deduplication of call log entries (issue #176).

 - When this app is the default SMS app, add a warning to the app's main screen, as well as a button to bring up the default app settings (when API level >= 24) (issue #139).

 - Support dark theme (issue #181).

 - Overhaul notification framework - by Andrew Gunnerson (chenxiaolong) (issues #34, #179, #183 / PR #187).

 - Update French, Spanish, Turkish, and Vietnamese translations.

 - Update Android Gradle Plugin (AGP) version and various Gradle dependencies.

 - Refactor.

