Unstable release 0.9.3 — Endless Sky Steam update #846154

This is an "unstable" release, which introduces new content and features that may contain new bugs. To upgrade to this release, you must opt into the "beta" branch. Changes include: Minable asteroids (twelve different elements you can mine). New Wanderer ships and missions. New Hai carrier ships, fighters, and weapons. Many small UI and game engine improvements. Bug fixes include: UI bugs when multiple buttons were pressed simultaneously. Invisible ships are no longer targetable with the mouse. Fighters that return to their mothership no longer count as destroyed. Intro tutorial is now shown even if you visit the bank before buying a ship. There are many other changes, as well. For a complete list, see the changelog. Special thanks to everyone who contributed to this release: @Amazinite, @davidwhitman, @jafdy, @KiLEdEnNis, @kitsunemochi, @lheckemann, @LocalGod79, @Mailaender, @MarcelineV...