UI Improvements. Add a premium level.

Bug fixes

- Fix issue when the app is paused and goes to background - Improved UI

This version includes: A new widget. Bug fixes.

Fix an issue with notifications.

- Improved UI - Timer repetitions are now customizable.

Fix bugs. Fix incorrect messages syntax.

In this version: - Fix issues when paused introduced in the previous version.

In this version: - Improve iPad Layout - Fix issues with notifications when the timer is paused.

New features!! - Multiple timers - iPad support - Fix issues with notifications at the wrong time. But, we also drop support for iOS 13.

- Now shows the estimated time of completion when setting up the timer. - Fix minor UI elements issues - Fix issue with notifications when the timer is paused.