Update 1.37c: ADS improvements

[CHANGELOG]
- Add: Camera shake of bullet impact near player
- Improve: Underwater VFX rendering
- Improve: First-person ADS mechanics
- Improve: First-person view without ADS
- Fix: NK46 Mod.4 could block screen of first-person view
- Fix: Camera error when player use ADS with high-ready position
- Fix: Attach dual sight could have wrong location if second sight used
- Fix: Some AI pathfinding errors