Changed flamer HUD position

-changed sniper sound
-updated texture for knife and laser (thanks to MrWildSillycat)

- weapon change animations from Xbox version
- updated textures of beheaded soldiers
- updated grenade launcher model (now it's more like the xbox one, big thanks to MrWildSillycat for sources)
- laser gun with new barrels, also changed HUD position
- knife position is OK=)
- fixed muzzle flash positions for some weapons
- updated barrels of double shotgun
- Xbox crosshair
- other minor changes