Merge pull request #454 from Meumeu/dev

Fix a NullReferenceException in the advanced interplanetary transfer if the spacecraft is in orbit around the Sun
Reduce micro stutters in landing prediction

Moved AdvanceToFreefallEnd method in secondary thread, with a copy of
the original orbit.
Merge pull request #456 from xytovl/mumech/dev

Reduce micro stutters in landing prediction
Fix the Exception in the LoadingScreen.
GuiUtils.skin is still null this early.
Imports landing AP site and runways from KerbTown/Kerbal-Konstructs, RSS and a user created file (example included). Adds an infoitem button to copy Lat/Lon/Alt to clipboard
Right version of previous commit and without debug spam
Update for .25 change to ModuleLandingGear
Update CompatibilityChecker for .25
Fix EditableTime behaviour