SuperTux 0.6.0

I am pleased to announce that SuperTux has been upgraded to version 0.6.0 in the Fienix software repository. SuperTux is a classic 2D jump & run game. SuperTux version 0.6.0 features a complete redesign of the icy world and forest world. Graphics and animations have been improved, and various visual and shader effects have been added. Additionally, many bug fixes and performance improvements have been incorporated. 

Thanks to Christian Zigotsky for helping to resolve build issues so that we can enjoy SuperTux!