Tune enemy movement logic

Now the logic is straightforward and not so fragile when we add some new
complexity. Next step I think is to make it all based around traits or
some kind of generics, and then we can plug in new enemies. Ideally
we'll just have the game represented as a list of phases, where a phase
is just an object, and the player will progress through them in order.
Because it has to be a concrete object, I think we can embed a function
pointer into a struct to get most of the functionality that we want.

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