fix Lua console so that it lets you continue incomplete commands

It was always supposed to do this, but at some point (probably the
switch to Lua 5.2) it stopped working. If return is pressed when the
current command is syntactically incomplete, it will insert a newline
and let you continue the command (instead of giving an error message)
Try to fixup big_crappy_spacestation.
Moved the collision_pad1 object into separate mesh due to 3DsMAX being rubbish.
Extended collision_pad1 down the neck of the station.
Updated the ground_station with separate collision pad mesh.
Extruded the centre line edge upwards to provide better contact point.
update changelog