v7.0.20

• Convert remembers what it is making. Leaving the screen during an image build and
  coming back showed "A package" selected and package stage names while the image kept
  building. What to make and the image choice are now remembered, follow the build that is
  running, and an image build's stages read "Plan image", "Write image", "Read the image
  back".
• Fix: the game page could crash on "Measure how it plays". When the engine's reply had
  no state (an engine without the route, or a test stand-in), the card threw and the whole
  game page fell back to the error screen. It now treats that as nothing recorded.