* Animated GIFs are prepared again, so they actually play. Nearly every GIF
  marks unchanged pixels as transparent - that is how they are compressed - and
  0.8 read that as a see-through picture and refused to prepare it, so most
  animations fell back to the slow path and barely moved.
* The image inside the digits no longer drags the whole screen onto the slow
  drawing path. On a tablet that was the most expensive thing the app did.
* A picture that costs more than full speed allows is now slowed down instead of
  stopped, so it keeps moving on an old device rather than freezing.
* Each prepared image says how many frames it holds and at what size, next to
  what it takes on disk.
