updated ammo preference for the M40

reduced recoil from the M40

tweaked the fire rate of the spotter rifle

tweaked aiming speed for the M40 and the TOW launcher

fixed missing materials and buffed M40 turret rotation rates

updated the M40 gun to include a flechette round

fixed error stacking and tweaked acceleration

increased TOW missile lifetime

nerfed the health slightly and slowed down acceleration slightly

nerfed the health slightly