New ammo types

[viggen5199 11]

Several new ammo types that should be added:

Hollow points: Massive unarmored damage, but very low against armor and vests, common for pistols

FMJ: The AP for higher calibers, good ballistics and aerodynamics, and great bear defense

Subsonic ammo: Removes the weapon crack sound, but travels slower --> less damage

Custom hollow points: Use your knife to make improvised hollow-points by cutting an "X" shape in the bullet

Birdshot shells: Double the pellets of buckshot, but also half the damage for each pellet, loses velocity fast

Flechette shells: Very small, fast "arrows." Great over distance, with good armor pen and damage, tradeoff is rareity