fix crash when docking with a voxel harvester
get to work automatically
avoid an unneccessary conversion FieldLoader can do
stop pretending this is configurable and use MoveTo

fixes #5682
StyleCop
add a voxel harvester unload animation
fix VoxelAnimation.DisableFunc being ignored
spaces to tabs
tweak the DockOffset a bit
StyleCop
document for modders
new trait Parachtuable that decides on the fate upon landing
new setting to allow unlucky paratroopers
@pchote's quest against legacy truth value definitions
merge ParachuteAttachment and Parachutable
make the parachute animation optional

instead of hard-coding default sprite sequences
make the parachute palettes configurable
add a customizable parachute shadow

closes #3335
make the fallrate customizable
fix shadow sprite not being rendered on the ground