minor ai fixes

Improved the suspension on Vickers tank and tankette, replaced old MG model on the tankette with more detailed one, added custom tankette and truck map icon

Fixed planes spawning higher than they should, making them take fall damage after spawning, fixed suspension some vehicles

Updated particles, added new sounds, fixed planes acting weird

Fixed tankette suspension, made tankette and tank hide playermodel when inside, changed symbol on the fighter plane

fixed steering wheel

Fixed Vickers MG on stand and on tankette having different sound

Updated particles and sound effects

adjusted sound volume

Tankette now uses a different engine sound and fixed all the issues with turrets acting weird in first person