-fixed the plate on the back of the engine on having the wrong texture

-fixed 2 of the pistons not making a sound at the apex of their travel

-added models\props\cs_office\light_security.mdl to the files for people without css

-added cubemaps

-added proper collisions to the fly wheels, piston arms and piston heads

-removed herobrine

i forgot to include the file "sound\ambient\levels\citadel\stalk_stalkertraininterior_loop.wav" for people who don't own Half-Life 2: Episode 1, the map should be fully featured for everyone now.