adjust fire particle use,add recoil spring model from mg34

fix bolt part,change "smg_a_worn" materials back to "smg_a"

add extra $cdmaterials for custom skin support

animate ammo belt for idle,run,itempickup/helpinghand and look poses animations,add incendiary fire sound

forget to compile bolt,charging handle and clip bones

reset sound scripts,add custom property for custom drop sound

fix w model ammo belt not movement bug

remove old source files and unused textures

remove hud icon(it's in doi mg42 already)

fully reriged to make it looks original