[Implemented] Add Rockingham (Corby) to the Track Rotation?

[SIMOX]

Small map like South city is fun yes but this is not the same. South city is narrow, bumpy and visually more pleasing.

If you don't want people to get bored of it in first 2 days, block some part of the oval and force people to go through the inner part of the track. Rework the inner track layout because it's super restrictive to the point where it's boring.

Also thank Scawen for adding tunnel that leads nowhere. Would be actually good part to cruise around.