v0.13.2

I completed the background map to show whole Europe.

Navigating the map with the mouse and the keyboard is restricted to the area of Europe now.

The game engine Unity is updated to the latest long term support version 2021.3.x.

Current development:
I work on adding a country neighboring to Germany. The Open Street Map data is semantically a bit more different than I thought. So adding new countries will take longer than thought.