Added delivery job levels so the higher the XP/level the higher the payouts

Fixed broken traffic near the oval track

Lowered the slower oval races payouts

Increased the default (medium) AI difficulty

Fixed a bug where parts would get damaged on the dyno

Added a new wiki article for circuit track tuning

Disabled volumetric clouds from "low" sky quality to help running the game on lower end GPUs

Fixed a bug with cars being parked randomly instead of how they drove into the garage (face in or face out)

Fixed issues with navigation on some roads, also affected the delivery payouts