9: Balance again

After I finished the development of the iterative game progression options, I started to work on a balance again. I designed all building options, which are opened to the player step-by-step. I configured how many entities are available for the player to build on each step. I also added random generation of the next building option. This feature will be used if the player overcomes all set challenges.

I also added random initialization of the map. Now, the map is randomly filled with grass at the start of the game.