Add suppot for mmc option (paid) to get vehicle orientation

[hdurdle]

Adds support for setting mmc true in request to receive orientation of vehicle in results.

Doesn't impact default behaviour, but if you've paid for the mmc tier that can return the orientation of the vehicle, setting mmc=true in your config will request the orientation and populate it in the attributes.

[robmarkcole]

Many thanks for the contribution @hdurdle

Could you also address https://github.com/robmarkcole/HASS-plate-recognizer/issues/33

Cheers