Added Tier1 and more melee weapons.
Moved existing guns slightly upward to fix AI not picking them up sometimes.
Moved part of the conveyor (Yellow base), and matched Navmesh to it.
Added more ladders for CI.
Added previously missing sounds.

Swapped population to L4D1 population
added sound to starting button
added teleport brush in coal compartement, should you somehow get trapped in it.
added materials around the maps so versus survival has no holes from infected only areas