Added the ability to restart the game after a game over.

The function that handles this is the on_exit of the game lost state. This function is not meant to
be permanent, but is just a placeholder while we decide what we actually want to do when game over is
reached.

source/main.c

@@ -77,6 +77,7 @@ void init()
     blind_init();
     joker_init();
     game_init();
+    game_change_state(GAME_STATE_SPLASH_SCREEN);
 }
 
 void update()