Version 0.401a changelist (vehicle naming fixes)

Tweaked layout of part categories when using mouse+KB (gamepad version unchanged)
Fixed text entry for vehicle name trying to edit the wrong string
Fixed text entry for vehicle name/description sometimes entering on the left side of text)
Changed Steam Workshop upload to make it more clear you're not editing the actual vehicle name
Synced name for saved vehicle name and the displayed name (it uses the name if set, or the saved one if not)
Fixed newly-placed flex connection parts drawing lines to unconnected parts