Beta version 3; mainly just bugfixes

Earlier versions had some major and some minor bugs. So here comes beta version 3, which hopefully fixes all the fatal bugs. I also made some minor changes which increase the likelihood of the game now running on Mac as well.

Now we also have a native Windows downloadable, which contains everything what is required to run the game. Inside the installation folder there is an .exe file which you can just run, no need to have Java pre-installed on your machine.

Regarding the actual game content the most notable addition is an UI button to quit the game.