Reduce volume or remove sound of break projectiles shot by NPCs

[szapp]

The auditory feedback of breaking projectiles on impact is very useful for the player. However, when being shot at by NPCs, the noise is very loud, because of the proximity to the player. In a ranged fight, it can turn into constant noise.

Either reduce the volume altogether or disable the sound for NPC shooters. The latter is viable, because the player generally does not need auditory feedback for projectiles not shot by them.