Added a new location named Safehouse 13 on the border between Russia and Yukon (it is not an actual safezone)

- fixed my slip-up of somehow duplicating almost every object on oil rig (didn't affect zombies or loot tho, and was only noticable in-game via containers with 2 sets of doors)

readded original airdrop locations that AMIO may have deleted/moved + gave Oulton's Isle castle loot and zombies

Fixed a slip-up causing all military_low loot tables spawning mafia loot + revamped sylee bridge design cuz i felt like it

edited for a friend