parser: rewrote entire system to use Lua

Now you can make spirals of objects with just a few lines. The parser's still a bit buggy. I'm having a ghost item appear from time to time and disrupt my count. So don't try enabling forces right now. Molecule importing works, although might segfault on exit(free() fails). I thought about switching molecule reading to Lua, but I'd rather abstract that part in C for now. Will work on getting it stable soon. All math libraries are included so have fun drawing hearts or whatever just to see them disperse due to some mysterious force called electrostatics.