set the center title of a card with a key in the data hash

Only use the center title if the game doesn’t have an image
place center-title in the middle
make sure control-info bar is on top
normalize the css for cards
add image() method to other models

Let’s do it like this so we have a consistent api
everrrrbody be image'n
don't filter on game art anymore
Merge branch 'default-rom-art' of https://github.com/jugglingnutcase/kart into default-rom-art