Updated nodegraph (there will be a performance drop in some areas)

-Packed all L4D2 textures
-Packed all but one L4D2 model
-Packed majority of L4D2 decals and overlays
-Additional details in certain areas
*Gas station bathroom (grafitti)
*Cold lab (fog)
*Cargo elevator hall parkinglot (pipes doors and vehicles)
*Added OSHA approved hazard marking to certain blast doors, lifts and crosswalks
-Slight performance improvement down down down by the river

Big thanks to quantumdylan for helping with the L4D2 content!

The map nodegraph will be fixed by the end of the week.

-Fixed AI Nodes for hopefully the final time
-Improved AI node coverage
-Increase AI node jump points to allow for more complex behavior in fast zombies

-Added map icon
-Fixed AI nodes (hopefully)

Updated the map to provide new areaportals for:
-The gas station
-The lumber mill
-The gravel silo hideout
-The trainyard receiving garage
-The Engarde lab building
-The partially barricaded house
-The survivalist house
-The abandoned house
-The bunker access house

New Additions:
-Added a new scripted sequence
-Added a small tweak to an existing scripted sequence
-Added more detail to all of the houses
-Added details to the Engarde lab roof
-Added more detail to the receiving garage in the train yard
-Added details to the cafeteria
-Added small details to the gas station garage
-Added missing light props to the zoo containment cells
-Misc lighting improvements
-Packed HL2 EP2 assets

Bugfixes:
-Fixed some missing textures in the main security office
-Fixed a floating light in the cafeteria
-Fixed double doors not being correctly linked to each other
-Fixed some floating trees outside the map
-Fixed a small seam in one of the displacements
-Fixed incorrectly skinned props
-Fixed a few missing sounds
-Fixed a bad reflection in the partially flooded garage
-Removed a broken decal from the underground

-Fixed corrupted navmesh
-Patched missing path node

Added AI nodes.