Release v0.8.0

Added

• Added a mechanism for traders to have a minimum trade deal value requirement. It is off by default, but turning it on makes it so trader won't accept trades that involve goods of a total value lower than the set number. This is meant to add to the realism a bit to avoid traders sending whole transport ships to deliver a single bottle of beer.
• Patched transport hauling code so that hauling books out of bookcases now works as expected.

Changed

• The second shuttle that delivers goods to the player now chooses its landing spot just-in-time instead of ahead-of-time. This should hopefully avoid things like it landing on top of other shuttles that have arrived in the meantime since the landing spot was originally chosen.