"STK w/Irrlicht": Player math

Welcome to the first update this month. There have been so many changes since last time that I'll give you some of the news now, and the rest of it later, so stay tuned. :)
You may wonder what "Player math" was supposed to mean. It doesn't have with "Oliver's Math Class" to do, but good guess.

"Players" screen

Here we do the math: adding and subtracting and multipl(a)ying... erm, at least the first two. It impacts the kart/profile selection screen now as well.
Not only that, it's now possible for another controller to join the game as another player, though work has just been started on the complicated matters of offline multiplayer. Online multiplayer is, as you might know, not scheduled for SuperTuxKart 0.7.

In other news, there's been a lot of code cleanups, work on the new driveline system and animation support, optimizations in the menus and so on. Most of this is quite a work in progress, but as I said, there's more news to come.

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Note: As the "STK w/Irrlicht" branch is still in a very unstable state, the general public is recommended to use the latest stable version (0.6.1a) of SuperTuxKart.