0.9.86.6 Nerf rocket elites

• Now there will be a warning before elite enemies firing rockets • Overpen can no longer reduce damage below 1 • Ammo rack positions for all vehicles are now closer to historical accuracy • Fixed decoration placement issues on recently added vehicles • Reworked the model of the Tetrarch • The turret switching UI now also displays secondary weapons, making it easier to toggle auto-fire • Fixed a bug where destroyed props in Snow Town could still block HE shells