Add Game Mode options

[CompSciLauren]

Problem

The game currently requires draw-2 and draw-4 cards to be stacked. While this can lead to humorous results, it is not the correct way to play according to the original game rules, and is not the way the majority of users play the game. To make the default game option easy to understand for most users, the stacking feature should be removed. Instead, a new start menu option should be added to allow for alternative game modes and can include the stacking option there.

Solution

Add a new option in start menu to select alternative game modes. Remove stacking feature from default game mode.