#84 Migrade Preferances to AndroidX
- Migrade PreferenceManger and PreferanceFragment to AndroidX
- Rewrite NumberPickerPreferance for new AndroidX API
- Rewrite TimePickerPreferance for new AndroidX API
- Remove RingtonePreferance (no more avilable in AndroidX, moreover this preferance wasn't use in the whole app and hasn't any effact of the ringtone of notifications)