- Replaced text countdown with a background tile countdown

- Refactored settings.game.snake.color.palette into settings.game.snake.colors

- Refactored settings.background.tile.color.palette into settings.background.tile.colors

- Refactored background.cycleColors() into background.animation.randomize()

- Refactored settings.background.tile.color.random() into background.random.color.tile()

- The initial background.lastCycleTime is now 0