Use AndroidX + map rewrites to buttons

[Kaljurand]

• [ ] use SeekBarPreference for "Max recording time"
• [X] use SeekBarPreference for the number returned recognition results
• [x] some vector icons not visible or not respecting Theme (https://medium.com/androiddevelopers/using-vector-assets-in-android-apps-4318fd662eb9)
• [x] app list does not have action bar
• [ ] DetailsActivity does not supress the actionbar
• [X] switch is missing in rewrites (causes crash): https://guides.codepath.com/android/fragment-navigation-drawer
• [ ] add empty text view to every ListView in XML
• [ ] maybe collapse some advanced settings by default
• [x] test on Watch
• [x] make sure landscape layout works
• [x] add tabbed clipboard
• [x] use DayNight theme