VDrift crashes if the car hits an object real hard!

[thelusiv]

In the latest SVN (r1315) I have implemented a simple try/catch in main.cpp, and a few throw statements in track.cpp, so that if we encounter the NAN problem we can put an error menu on the screen, and then leave the current game. This works, but the car engine sound continues looping after the game has been stopped, and never stops playing until a new game is started or VDrift is exited.

This might be a good point to think about reintroducing Matthew's logging class(es). We need a more complex error class to throw, instead of just std:tring, that can contain more information about the problem.