Improving the 2048 game

[CRImier]

The 2048 game (included in apps/games/g_2048/) could use some features; namely:

• A prettier UI - going away from the text-based data output (using o.display_data()) and drawing a canvas instead, then passing it to o.display_image().
• Currently, the game can't be continued once 2048 has been reached, it'd be good to allow it (and still acknowledge the endgame as a 'win' once the field is full) (done, thanks to @johanneskool )
• Once the previous feature is done, highscores could be added. (done, thanks to @johanneskool )

[CRImier]

Also, the game just feels too easy to get to 1024, for some reason. It's possible that there's some kind of constraint that needs to be added.

EDIT: added a chance of spawning 4 instead of 2, which made the game more complicated (and it's the way that other 2048 implementations seem to up the complexity)

[CRImier]

BTW, thought about this - the game could use some kind of main menu, like:

• "continue"
• "start"
• "highscores"
• "exit"

once OK is pressed, instead of just having a DialogBox like we do now. That'd conform with the way that games on earlier mobile phones worked, and possibly make the code more readable&reusable, too!

[CRImier]

Accidentally closed, reopening