[NAG] Little Change IV

- Re-ad muzzle flash lighting for NPC
- Add weapon_smg2
- Add acsmod_bullet_penetration_ratio
- Lower weapon on sprint and crosshair hide
- Correct headshot / blood effects
- Melee weapon little change
- Increase sprint speed
- Bullet spread more
- Use for pickup ammo & weapon
- Add acsmod_ragdoll_pickup
- Add acsmod_edgeclimbing
- Little other things