Added a few things

[Forest239]

• Added timeout parameter to the Client, so it can be defined when instance is created instead of being hardcoded to 10 seconds.
  This was necessary because, especially when using driver_stats() as this may take more than 10 seconds.

Example
To set it to 30 seconds
ir = Client(IRACING_USERNAME, IRACING_PASSWORD, 30.0)

• Added car_name to the Subsession Driver object, not sure why it wasn't there.
  I tried going the long way around it first, by getting the car class, iterate and find a match from the car_id, and this works for older seasons, but not the newer ones.

However it car_name seems to be present in GetSubsessionResults for old and new sessions.