#71 Button behaviour change

[k_uber]

Simple forward and back operation. I.e., depress a button once and it flips the card, press the same button again and it goes to the next card. One other button goes in reverse of this. Right now, you have to hit one button to go forward a card and another to flip it. I would imagine that this would be a very easy option to add in preferences, but I am not a programmer and have no idea how to do this. (Jake (sirjake81) )