Clean upload without Git files messing up the works. :-)

-Added Argentavis
-Added Mercenary

- Added Ghoul Corvette
- Added Hydro Tanker
- Added Ponos
- Added Corvette
- Fixed Skyheart spawn speed
- Fixed Pirate Raider spawn speed

- Fixed Vulture spawning

- Added Vulture Encounter
- Update to Commercial Freighter, Military Minelayer, and Mining Transport

-Updated Skyheart Refit
- Added Cargoship versions of Skyheart Refit and Imp Refit
- Added Imp Refit Encounter