Add new weapons and fix some weapons

1.Add new weapons ,props,vehicle,gear
2.fix sounds,texture
3.Remaking humanskin

1. Wiesel 1a4 has added a spring chain animation
2. Added MG82 to replace MG3_craw model
3. Modified the sound effects of guns and submachine guns
4. African vehicles are still in production
5. Simplified code
6. Added toxic gas
7. Increase the desire for radio attacks
8. Added multiple sounds of calling for artillery fire
9. Reduced the proportion of airplanes
10. Modified some vehicle textures
11. Add damage animations to certain vehicles
12. Fix internal textures on certain South African vehicle gun barrels