General stuff

So, basically, this contains code for a mecanum robot controlled by an Arduino. However, that does not mean that this may not be used for something else -- this contains general drivetrain code, general vector math, general joystick input, general interpolation, general Arduino ethernet communication code, etc. etc. Also [experimental], there is a header that would allow a "simulated mecanum drive" in software, motion planning, etc. Basically, there are lots of goodies in here. Dig in! [And contribute if you want! Try to keep as much as you possibly can compatible with C, though. Also try your hardest to write in a functional style if you want to contribute -- no messy mutation-heavy stuff -- makes it hard to verify individual portions of the code]