Started implementing the functions and class for Highscores. Added a function to class Game to check if there is a standoff in the game. Adapted Game to stop accepting keys after there was a win or a standoff.
Removed a lot of code and made it easier and much less error prone to set up the scene.
Removed unnecessary comments.
Added a function to remove stones from visibility. Scene can now be fully reset by clicking the Start Game button.
Game is now immediately playable after start up of the program with default values.
Merged with branch xperimental