Implement a generation algorithm for ground mesh surface normals #347
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Probably not the most efficient way to do it and somewhat verbose, but it works and that's enough for now. Improve later, if need be.
This brings down the geometry generation time by 100ms or so? Still not amazing, but much less of a slowdown (and an easy win to take).
Another easy win that takes down the time required to generate normals for the terrain geometry by maybe 50% of the added time or so.
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It could likely use some optimization, but for the time being I don't particularly care to spend more time on this.
Resolves #333.