Fixes map corpse spawn bugs and expands on spawning corpses on the map

I meant to do this in three different pulls, but Git fucked me.

@Cheridan told me to how to fix the monkey and slime corpse spawn runtimes, and @Razharas told me how to fix the AI corpse spawn runtimes. So thanks to them.

This also lets you spawn dead slimes, dead facehuggers, and dead AIs on away mission maps. I'm using this in my upcoming Box2550 away mission. Also lets you set the gender on dead humans, set whether they're changeling husks or not, set their brute and suffocation damage.

Dead AIs can be carded, but not fixed. Though you can set the oxyloss on a dead AI to 200 so its system integrity is displayed as 0% on its card, attempting to fix the AI in the RD's console will cause runtimes related to screen position on the mob. So currently carding the AI gives you a card of a dead AI with 100% system integrity, which prevents players from repairing it. It's annoyingly inconsistent, but I couldn't fix that runtime, because I'm dumb.

Don't crucify me please, I'm sometimes nice.