Big Update to version 4.0.4

Version 4.0.4
Dec 4, 2020
In this version:
New:
- Some icons have been changed
- A single ‘History' is now directly accessed in the TabBar
- The views for ‘Overdue’ and 'Completed' can be reached by two new icons in the navigation bar
- A 'Refresh Controller' has been implemented where necessary to reload the lists
- In addition, the interface has been refreshed and made more pleasant
Other:
- some maintenance in general on the code