Release v1.3.0 - Graphics Update

- Hexagon graphics update
- Unit graphics update
- Graphic resources loading improvements
- New game save logic
- Supported loading new games from saves
- Game menu UI update
- Fatigue mechanics update
- Pockets closing after every move
- Supply calculated after every move
- Faster pockets closing and supply algorithm
- Eastern Front 1941 map balancing
- Added scrollbar for dropdown and text area
- Minor code improvements and cleanup
- Bugfixes
- New map Demyansk Pocket 1942