Update OnUnoccupiedVehicleUpdate to support 0.3z

I think I got it right! :)
UFS 0.3z support: OnUnoccupiedVehicleUpdate
0.3z: OnUnoccupiedVehicleUpdate

Forgot something :P
Merge pull request #68 from AndreT/master

OnUnoccupiedVehicleUpdate syntax update for 0.3z