Improvements to win animation

[Tomin1]

A basic version of win animation was implemented in #5 but that could be further improved. In particular I'd like to see more variation in the animations, perhaps different (selectable) animations, if there are enough viable ideas to implement. Feel free to tell about your ideas and experiment with the code. Note that there are some things you need to consider:

• Some games have stacks of cards per suit, like Klondike.
• Some games put those stacks to other positions on the table, like Beleaguered castle.
• Some games have single cards on the table, like Maze.
• Some games expanding stacks of cards, like Osmosis.
• Some games don't have any cards on the table at the end, like Helsinki.
• Some games have a combination of these, like Wall.

Yeah, it's a lot to consider. But any improvements, big or small are welcome to be discussed.