* Minor fixes to reminders

Internal build

* Added optional subscription payment model
* Improved performance of audio loading
* Reduced frequency of ads for new users
* Added links to terms of service and privacy policy
* Minor cosmetic fixes

* New quiz UI which shows previous numbers including counters
* Quiz time entry is now a number field
* Fixed bug which displayed times over two minutes incorrectly
* Various bug fixes and performance improvements

Improved performance issues with ads

* Reminder notifications can now be set
* Fixed issue where counters list was obscured on small screens

* Reminder notifications can now be set
* Fixed issue where counters list was obscured on small screens

* Japanese counters are supported
* Presets can be named and re-ordered
* Numbers can be skipped during the quiz
* Improved layouts on tablets
* Bug fixes:
  - It was possible to go back from the menu screen after a quiz, leading to an invalid screen
  - Leaving a quiz would sometimes cause a crash when halfway through audio

Fixed a bug with screen display