-Fixed perfomance issues with last update

the last update causes performance issues

-improved the SteeringWheelKeyboardGamepadControls script
-fixed the SteeringWheelKeyboardGamepadControls script for split screen desktop users.
-fixed SteeringWheelKeyboardGamepadControls script so when a Keyboard or Gamepad user leaves the driver's seat , it returns the steering wheel's original 'move back to start' settings.
-added the improved SteeringWheelKeyboardGamepadControls script to the HoverVehicle.

-added desktop controls script to the Truck prefab
-Lowered the rideable seats in the Truck a little bit.
-changed back the HoverVehicles script to World.UpdateFixedFrame and added [Local] attribute to it which I found out was needed to get the script to work for clients when playing online.
-turned off Auto-Connect on the Truck prefab which I forgot to do last update

-changed HoverVehicle desktop controls script from world update fixed frame to main.update , because I'm not sure if clients can control the vehicle before (found this out today testing 'Snow Racers!' creation
-added DeathBeam explosion effect
-made top of radio tower climbible
-fixed exiting FlyingSaucer seats teleporting you half way across the map with a new mbscript component.
-fixed firing DeathBeam on the FlyingSaucer killing everyone inside the FlyingSaucer.
-added FlyingSaucerMovementSound component to the Flying Saucer which plays a sound effect depending on if you are moving or not (script copied from FlyingDrone in Sci-fi mod)
-Added FlightSchoolStudentVR player avatar and set the creations default VR player avatar to it. This Player avatar doesn't have the 'Die on Collision' component which was causing too many unexpected deaths for VR players when they exited their vehicles
-Turned off Auto-Connect on all vehicle prefabs which makes it easier to spawn a new one as it doesn't get stuck in the ground.

-tweaked HoverVehicle script slightly
-tweaked PowerLineDetroy script slightly
-applied prefab changes to HoverVehicle so that if you spawn another HoverVehicle it has the HoverVehicle script on it.

-took hit damage and hit damage scale with speed off from the car prefab as it was originally in this map. ( I accidentally left it on last update from importing this car prefab from another map that used those components.)
-changed car prefab to All Wheel drive like it was originally for this creation.
- Changed view Distance to 12500m.

-Added desktop controls for Hover Vehicle
-Added desktop controls for handbrake and turbo jets for the car.
-Added PowerLineDestroy script to the PowerPoles so when they get destroyed the powerlines don't stay floating in the air.

-fixed helicopter's joystick controls. They weren't outputting the correct numbers.
-Fixed seat position for the truck prefab.
-Moved Car seats down a little and changed seat pose to seated feet up.
-Added no collision to the Force dome on the Flying Saucer , because the collision mesh at the bottom of the dome is now closed instead of being open.
-fixed seated pose on Air Blimp , it's now standing pose again.
-Fixed dials on the vehicles.
-Upped the Motor Force on the Wind Turbines to prevent them from becoming in sync with each other.
-Lowered the Motor Speed on the helicopter's blades to try and lower the wobbling it causes.
-Made Modbox Statues destructible again.

-added missing car horn audio file and missing modbox robot statue model file back again after last save bug