Added more optimisations to the map.

(false I think I used the wrong map file, so not optimised...)

Replaced the path to the city with (wip) destroyed part of the city rather than a long hallway.

Fixed a door from opening into the skybox.

Added some nodes to the city.

Removed the gap going to nowhere.

Removed the pods and buttons.

Added a moveable metal cover over the sewers.

Replace a nodraw texture on the roof of the
train station, which made part of the roof
look like it was gone.

Added a temporary fix for a broken lift