Update 1.0.1: rockets finish their flight

A launch-week patch from your feedback in the forums. Thanks for it.

- A rocket in the air when the shift clock hits zero now finishes its flight. The clock reads 00:00, nobody can launch, build or shoot any more, but the flight that is already up gets its real height, its verdict and, if it reaches the Moon, its real time on the results card. The results wait for the last flight to come down, at most 90 seconds after the whistle.
- Shift length, said out loud. OPTIONS has a line under SHIFT LENGTH telling you the host's setting counts for the next shift they open, and when you join a yard the feed says how long the shift is. The setting was always there; now you can find it.
- Stuck fallback. A robot that drops through the yard floor is put straight back on its own deck, and pushing against something for a few seconds without getting anywhere reminds you of BACK TO MY DECK in the pause menu.

1.0.1 yards only see other 1.0.1 yards, so friends need the update too before you can play together. Steam installs it on its own.