A small bug fix

I noticed that during the Soviet border patrol scene, the patrol guy tends to get stuck by the boom barrier until you distracts him. The issue seems to be Unity's pathfinding algorithm. I made some changes to the boom barrier and now the patrol no longer gets stuck there.

This update also contains a LOT of hidden code changes for the Dead Zone DLC. These code doesn't apply to the base game, but potentially I might have broken something... Please feel free to let me know in Steam Community if you notice anything strange.

Thank you!