Heretic|Fixed: Prevent attacking Imps from getting stuck
When a thing is using the MF_SKULLFLY flag, verify that its position isvalid (unblocked) after a Z move. If not, restore the thing's old position.
Addresses bug: https://sourceforge.net/tracker/?func=detail&aid=3495787&group_id=74815&atid=542099
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Heretic|Fixed: Prevent attacking Imps from getting stuck
When a thing is using the MF_SKULLFLY flag, verify that its position is
valid (unblocked) after a Z move. If not, restore the thing's old position.
Addresses bug: https://sourceforge.net/tracker/?func=detail&aid=3495787&group_id=74815&atid=542099