Game & Demo Update v0.504

Hi adventurers,

v0.504 is now available on the game and demo branches:

• Improved stack management, you should not see anymore stacks popping after loading a game. And in general, less stacks will be created and more of them will be reused.
  
• Increased pathfinding calculation limit to allow to find a path in all situations even on large maps.
  

Thanks for playing, and please don't forget to leave a review, it helps a lot!