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Polygon fixes

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SHilbert and I worked through the night last night to figure out a fix for my polygon collision behaviour.

The issue was that the player could slide off of one wall and "rebound" through another very slowly. You can see the behaviour in
">this low-quality YouTube video.

It turns out the problem was that I used 'continue' in an inner loop when I meant to make it continue from the outer loop; this is the same issue as the AT&T Crash which paralyzed the United States' telecom infrastructure in the early 90s. So at least I'm in good company.

Anyway, I'm glad I fixed this bug without a ton of math required; Afterglow feels more solid now and I should be free to implement more functionality.

I will probably make another (higher quality) YouTube video eventually when I have more to show off.
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