Card overview experiments #2

I did a lot of polishing on the new card overview screen today. I've uploaded a gif, so that you can see how transmuting works on the grid. You basically need to long press the card icon to trigger the transmute dialog. I've added an experimental feature, some of you suggested a few times already: You can select how many cards you want to keep. That will work for auto-transmute, too. So you can say, auto-transmute all Mummy towers, except 3 that I might use later on... I believe this could be a quite useful feature!