render: Reimplement rendering engine using functional combinators.

Warning: This is a huge commit.

I completely gutted the old scene graph and replaced it with a somewhat
monadic rendering combinator module instead.  The interface remains
purely functional, but replaces the <model> data type with procedures in
the rendering monad instead.  This opens the door for
rendering *anything*, not just meshes.  Now I can implement particle
systems and other non-static things.

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