RSFY: track aggressor's losses

Widget
- Modified widget design and functionality for all available Android versions
- Added the ability to choose a widget theme and adjust its size
- Added data about the Day of full-scale invasion to the widget
Main screen
- Updated the progress bar design and made it more factual
- Created a separate screen for statistic details
- Developed a more versatile widget configuration instruction according to the latest updates
Other
- Fixed minor bugs based on user feedback