Updated addonlist to v3.1

- Fixed where there is too many guns on low player count
- Fixed some props in the attic
- Added a zombie ladder to the roof
- Added a breakable 3rd entry for zombies at the attic

- Adjusted the outside
- Fixed zombie ladder
- Filled some windows for balance & performance
- Added an attic to the house

- Removed a broken areaportal
- Added a new path for zombies to enter the house at the hill

- Fixed loading screen being the wrong texture

Initial Release