Allow user to play 2048 Expert endlessly

[Kanelmis]

Allow the player to keep merging tiles, including tiles higher than 2048, even after the game has ended. Currently, the game ends as soon as 2048 is achieved. However, the user might want to beat their previous high score and see what the highest tile that they can achieve is. The current version prevents this.

This feature request would involve supporting larger digit numbers with smaller font sizes. The new tile numbers should also have different colours.

[Destiny-02]

Approved, edited for grammar and clarity. Note that 2 other members must give approval before removing the pending tag.

[k1dubv1]

Approved