Add survivor's notes that add to the post-Cata lore

Thread these are from: http://smf.cataclysmdda.com/index.php?topic=1028.0

I have not tested this because I lack a good PC compiler, but nothing seems broken. First PR? woah. Thanks to Kevin, KA101 and Gracken

Also happens to add a tiny chance for mutated arms to spawn in vending machines, hopefully this doesn't cause the game to crash or anything awful