- Changed map name from v3 to v4

- Added more player spawns for Casual game mode
- Added actual saw model when player sawing off the pole
- Blade traps now kill zombies or make them crawlers
- Replaced all game_texts with env_instructor_hints
- Replaced boss model

- Fixed wrong path for soundscape and level sound files

- Updated lighting (map now supports HDR, so it might be darker)
- Merged first underground part and street (no more teleporting)
- Made a huge work on optimization
- Added more spawn spots for objective items
- Retextured walls in second underground section
- Tweaked clips and navigation
- Added soundscapes
- Tweaked 3d skybox
- Removed most of molotovs (so no more burning boss :p)
- Fixed plenty of bugs, added little improvements here and there
- Added zombie spawn brushes in some areas
- Replaced Winchester 1892 to Beretta Perennia SV10 in Father Grigori's hands according to loading screen