Allow a simulation configuration.
Sounds! And countdown fix.
Adding move sound (generated with Audacity)
Remove "keep going" completely for now.
Scores for each user taking part in the round + merged tiles now shown with the user who merged them.
Add move_invalid sound (made by carbilicon, license: CC0)
Add restart sound (made by pera, license: CC0)
More detailed licensing info for the sounds.
Add loss sound (made by Erokia, license: CC0)
Add countdown_tick sound (made by jorickhoofd, license: CC-BY 3.0)