[PKM Machinegun]

# General
- Less screen shake
- New Materials
- Optimized and saved content
- Fixed third person weapon holding
- Bullets on chain is moving smoother while firing

# Gameplay
- The gun shoot slower
- Reloading is a little bit more slower
- Damage per bullet it's 25

- Larger scatter for Non-Aimed
- Higher recoil for Aimed
- Fixed troubles with "Adjust recoil animation speed"