Added an option to go back once game is over

Added a feature that once your game is over, you have the ability to go back to the game and perform any moves that may be possible.

for example if i had 2 block lined up and once the game ended they are still lined up, i will have the ability to go back and kinda save the game by joining them together

no sure if that makes sense, just go ahead and play the game and you will see what im taking about