[WIP] [CR] Add an even harder start

This is based on the Black Road start from Misery (http://www.moddb.com/mods/stalker-misery/images/the-black-road). Currently it only adds zombies around the shelters. It should be harder. Some ideas:

- Less normal zombies, some military ones instead
- Fixed night start time for "Did I lose them?" factor
- Take away a starting piece of equipment
- Hardcore obligatory, but no points given

Would this idea be good enough for Cata?