Quick Play->Generate championship improvements

Now, IMO the Generated Championships are the best way to play this game if you are not really good. They allow you to have randomized stages and rallies along with the deformation and random weather. Literally perfect for me at least.

However I really think that there's a few things that shouldn't be too difficult to implement. First off, allow the player to choose the class of cars when generating a championship. It's quite annoying to generate a nice looking championship, only to then having to go through each and every rally and switch the class. This would make it so much faster.

Which brings me to the second update. Allow the player to choose the amount of rallies and stages for the generation. It's kind of annoying to keep spamming the generation, hoping to get a nice balance of rallies and stages. And even then, I don't think that the amount of stages can go beyond 4 or 5.

These two combined would make the mode so, so good. Imagine thinking, okay, today I want to practice some JWRC, I'll just pop that in. Hmm.. Maybe 5 rallies would be good, and 5 stages in each of them. Or maybe I want to do a marathon championship with all the rallies and stages.. Just put those on the generate options and let the game generate a championship for you in matter of seconds!

Also obviously go through the AI and sort its bugs. I'd love to do longer championships, but with the AI bug, I'm stuck on doing 3-4 stage rallies.

Game is really great! If these were implemented, I'd play nothing but this!