Fixes #9142: Horror form force airlock open finally works, horror form lings are finally voretastic
Created by: DrCelt
Horror form changelings can finally eat people like the ability description says you're supposed to be able to. Not sure why you'd want to, but it's there. Removed the broken "force airlock" verb, you now force airlocks open by clicking on them with an empty hand. The effect is still the same, namely: you still can't force open airlocks that are bolted or welded, which is kinda shitty because you can punch down walls anyways.
Horror form can also force open firelocks as if with a crowbar. Also fixes unrelated bug that didn't let you open firelocks with TK (remaining part of #12894).
Also added a shitty sound I shittily whipped up in shitty audacity.
- bugfix: Fixed horror form changelings not being able to force airlocks open. To do so, click them with an open hand. This still won't work on bolted/welded airlocks, though.
- bugfix: Fixed horror form changelings not being able to eat people.