-fixed a navigation issue where the level would fail to end properly in map 4
-removed some duplicate fence brushes

TEST UPDATE

-made bile jars and other items spawn less frequently in map 3

- removed an extra road brush that was added accidentally during a previous update in map 2

- fixed an issue with a clip brush causing survivors to get stuck when jumping out a window in map 1

- removed some brushes that were added accidentally to map 3 in the previous update
- shorted the length of the decon chamber's mist sprayer sound a bit

- added placeholder hint entities to all events
- various fixes and improvements to all maps
- navmesh updates across all maps

- added a custom finale script to increase the final map's difficulty
- many new tweaks and improvements to the finale's navmesh
- decreased the amount of empty space in the world

- replaced the L4D2 special infected with their L4D1 counterparts
- set up all maps for planned versus support

- added unique L4D1 populations to all maps
- many navigation mesh improvements
- adjusted the position of a rock cluster in map 5
- rebuilt all cubemaps