Multiperson vehicles

-- Vehicles with multi-person support --
 * X31 Landspeeder (2 seats)
 * X34 Landspeeder (2 seats)
 * Flash Speeder (2 seats)
 * AV-21 Landspeeder (2 seats)
 * XP-38 Landspeeder (2 seats)
 * AB-1 Landspeeder (2 seats)
 * V-35 SoroSuub Carrier (6 seats)

-- Abilities --
 * /offerRide -- asks the target player if they would like to accept a ride. This command also appears on the radial menu.  The "offer ride" menu will not show up if the target passenger is already mounted onto the vehicle.
 * /acceptRide -- Passenger accepts the ride.
 * /declineRide -- Passenger declines the ride.

Once a passenger accepts the ride, they are placed inside the vehicle and can ride along. Passengers can click on the vehicle to get the Enter/Exit Vehicle menu, which will drop them out of the vehicle. Drivers will be unable to kick people from the passenger group until they exit the vehicle. When the driver of a vehicle exits the vehicle, everyone else in the passenger group will too.