rstnode: implement viewport shifting

A bit of a rant: it's fucking ridiculous how much work it is to subtract
two points from each other with mint + nalgebra.  I ended up adding a
complete `Vector2` implementation in this commit because I got fed up
with it.

Consider this the unofficial start of librgx (rust graphics x), which
will basically become a libgdx in Rust, and the basis for the little
game engine.

Not to mention that ggez probably won't be maintained past version 0.6.0
unless some other maintainer takes over (I guess that could always happen).
Anyway, I'm annoyed!

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