Allow checking if a vehicle measurement is supported by the underlying interface

[peplin]

The parent class provides a standard interface for all measurements, starting
with a way to determine if a specific data type is supported by the vehicle
you're running on:

if(vehicleService.supports(VehicleSpeed.class) {
    // it supports it
} else {
    // if we try to get it and it doesn't support it, we throw an
    // UnsupportedMeasurementException
    vehicleService.get(VehicleSpeed.class);
    /* boom */
}

Some measurements may be supported, but may not have been received from the CAN
translator yet - it could be a malfunction, or you're just checking too early
for an infrequently updated measurement:

if(vehicleService.supports(VehicleSpeed.class) {
    VehicleSpeed measurement = vehicleService.get(VehicleSpeed.class);
    if(measurement.isNone()) {
        // do stuff with it
    }
}