new tool: fix/stuck-wildlife

[myk002]

vaporizes wildlife that is still on the map despite their animal.leave_countdown timer having reached zero

correctly identifying wildlife will be a little tricky. the conditions checked here might be good guidance: https://github.com/DFHack/scripts/blob/master/internal/notify/notifications.lua#L130

Other considerations (from Bumber)

• Wildlife can go extinct. Don't vaporize them without refunding the wildlife population count
• Probably also don't want to remove wildlife that's been deliberately locked in a room (if that can be determined.)