A few ambient additions

Footstep sounds volume balancing, small additions as well as more collision sounds.

Completed the antlion guard sounds, the first few door sounds.

New antlion & antlion guard sounds. Also a few modifications for water footstep sounds.

Big update adding all the missing, now totally new footstep sounds, also various more collisions and misc SFX.

Fixed a major issue with the last update, how silly!

New complete poison zombie sounds!

Fixed a problem with the turret sounds.

New experimental zombie sounds, expect changes! Added the step sounds for gravel, and new combine turret sounds!

Complete attack helicopter and dropship sounds, new combine gunship sounds.