replace bad c4 explosion particle
remove env_spark

fix missing c4 models (thanks valve)
fix light environment shadows (thanks valve)
replace some assets with train assets (thanks valve)
make fog less ugly, add some rain and wetness

fix busted tracktrain at the ending

prop dynamic fixes, drastically reduce tp volume

fix some clipping and rearrange some props
fix audio on the teleport
fix music volume
remove a radio
fix end_of_match
fix skybox lighting (i hope)

fixes

Created ze_namviet_p.