Add Quality export and import for Things on Gravships, don't modify GravEngine radius when it's already high enough

Fixed missing floors feature, fixed fogged up rooms problem, added floors to some of the example ships.

Fixed bug with Grav field extenders not working properly, added Wealth view and fixed "typo" (was actually the search box being too big and covering a bit of text.

Accidentally pushed a dev build, sorry !

Fixed automatic screenshots when saving a ship
Added random ship choice mode

Initial Version