Bounds checking is insufficient about particle-life HOT 5 CLOSED

It looks like it's fixed in the JS https://github.com/hunar4321/life_code/blob/main/particle_life.html#L163

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Please fix this

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The current code doesn't seem to do the right thing. It "resets to the wall" (Setting to zero and width/height at boundaries) and that creates some interesting and unusual artifacts near the border- which are more pronounced if you only use one "color" and a small number of atoms. Understandably, as the velocity vector increases- so does the strangeness. I think resetting to the "reflected" state (as pointed in the code by @redblobgames) is the better approach to minimize these effects.

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Fix added and also x4/5 times performance improvement for JS version - #27

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bounds checking fixed for C++ too

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