Bugfix: Shells tab not visible on vanilla mortars.

Slight rebalancing of building costs.

New graphics for ship wreckage, space insects, and more!

Bugfixes:
-Internal airlocks no longer randomly disappear on ship launch/move
-Shuttles no longer throw frostbite-related errors, and their health properly carries over when switching forms
-Space bugs use vanilla bug meat
-Ship bedrooms now satisfy noble title requirements
-Shuttles calculate their fuel properly and no longer endlessly demand to be refueled in caravans. Fixed several targeting issues as well
-Zero-G sickness disappears upon returning to the planet
-Prisoners no longer try to escape into vacuum
-Fixed the shape of Charlon Whitestone's ship, and other mods which use its BaseGen symbol

[Auto-generated text]: Update on 3/10/2020 4:03:38 AM.

-Valuable asteroids are valuable again (fixed an ore generation bug)
-Space sites should no longer generate identically to previously-visited sites
-Pick Up And Haul compatibility fix (thanks, Alnaeyah)

-Starship Bow quest can now re-occur after the original instance expires
-Asteroids no longer take an insane amount of time to generate

Bugfixes and slight rebalancing.

Ships can now be moved around the orbital map or landed at a colony site.

[Auto-generated text]: Update on 3/5/2020 6:56:42 PM.

[Auto-generated text]: Update on 3/5/2020 6:20:04 PM.

Re-upload of previous update. Colonies who have already jumped worlds should now be safe to update.

Thanks to Zero for a prompt bug report!