Spider nests in your basement!

Added a spider nest basement (the same as the junk basement, but with webs and egg sacks and a lot of angry black widows). Speaking of egg sacks, they are a new piece of furniture that spawn together with spiders, you can examine them to collecting spider eggs, and they even have a chance of spawning spiderlings (a super gross videogame classic isn't it?). 

I also fixed a bug when opening and closing safes and added the new spider egg item to the spider mutagen recipes (can anyone think of  more uses for them?).