Added a new minigame: Minesweeper

• Allows you to choose a grid size between 10x10 and 32x20

• Allows you to set mine count somewhere between 10 and half of the total tiles ((widthxheight)/2)

• Has a secondary gamemode where all unflagged mines move whenever you reveal a tile

Made various changes to the Bullet Hell minigame

• Made various changes to all challenges besides Spin Challenge

• Added a new challenge, "The Pattern"