Minor sound tweaks.

Fixed clipping in vent and more prop popping.
Added ambient sounds but need to fine tune them to prevent them playing everywhere.

Polish and optimisation.

Thanks to Enemenema.n for a lengthy bug report

2018
20-OPTIMIZEEN

More optimisation and polish, increased and reduced draw distances of many props. Please report if any props are popping in too late that aren't very small ones.

Thanks to Wartorn for the advice, made some of the changes he suggested along with bug fixes and other visual improvements.
Sewer is now slower due to its positional strength, also to make it make more sense in the world.
Improved lighting A site.
slight performance increase.

Still a long way to go but I intend to update this map many more times over the next month so if anyone has any suggestions or feedback it would be appreciated.