Building Defenses, Repair, and Ruin

Added

• Humans can reinforce a building to make room for barricades
• Humans can barricade a building provided they have available room
• Humans can be prevented from reinforcing or barricading a building if a zombies are present
• Zombies can ruin/ransack a building to prevent humans from using it
• Toolboxes can repair a ruined/ransacked building
• Buildings can decay when ruined (costing more AP to repair)

Changed

• Item condition spawn odds based on ruined/ransacked/intact state instead of powered/unpowered state