A Content Tracker for VDrift

[joevenzon]

Sounds like a good idea, my comments:
1) requiring a central server set up for this might be problematic unless we can host it easily on vdrift.net
2) I don't think this should be used to determine what data set to include in releases; the whole idea of the car/track downloader/updater is so we can distribute a very minimal data set for releases and allow people to simply update their existing data from an old release or download new cars/tracks