Few bug fixes

Fixed a few clip brushes
Added different common infected variants (ex: CEDA)
Instructor Hint not working anymore (Reason: ???)
Fixed table godspots (Radio table and weapons table.)
Re-opened the vent entrance (Only Commons can spawn there now!)
Machetes can spawn now

Complete overhaul of the garage
Fixed a hellaot of issues!

Fixed fire escape having a clip brush instead of a npc clip brush (Reason: SI AI cannot navigate properly there.)
Fixed instructor hint not disabling in Versus Survival
Added a few more details
Added sprites to light sources for realism

Added areaportals on crucial areas (Optimization)
Added more melee weapons
Fixed optimization overall (Hint and Skip)

Added 'Pain Pills' near the fire oildrum
Added more color correction
Small prop-fade tweaks (Again)

Extended func_vclip_physics brush in the gascan room
Removed 'Versus' entities (Served no purpose)
Added a 'env_instructor_hint' in the radio
Removed the collision in the prop 'roll-up_door_open.mdl' for smoother movement
Small prop-fade tweaks

Improved Lighting
Improved clipping
Removed the generator and crates group(Nav-mesh problems) - Replaced with a barrel

??? WHY IS THIS CONFLICTING WITH CRASH STATION

Blocked the vent passage(Special Infected couldn't navigate)
More nav-mesh fixes
Added more cubemaps