Lunar Lander 0.9

This update hasn't changed the vehicle itself, but has polished the experience with using the Moon map. You no longer need to enter the gravity code, as it is now done for you automatically. In addition, I've linked the gravity tab of the environment menu with the moon's spherical gravity, so setting the gravity to, say, 'Jupiter' will set the moon to an equal spherical gravitational pull at the surface.

Also, I've placed a handful of astronaut footprints around the moon, currently only at the landing sites of Apollos 11 and 12. Landing within ~50 meters of the Apollo 11 site in the Moon Landing scenario will grant you a special end message.