Fix keyboard event listener to allow continous keyboard event updates
Refactor Window module to GameStrategy::Main class for better modularity
of code
Add speed property to game strategy class
Add score property to game strategy class
Refactor TetrisMap spec in accordance with new app design
Refactor Movement Class in accordance with new app design
Refactor Squeeze class in accordance with new app design
Refactor GameControl module in accordance to new app design
Don't store generated shapes in memory anymore