Add a parameter for blur amount in the Fire 2012 effect #4078
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With a larger 2D matrix, blur becomes very expensive in terms of performance. On ESP32 with a 32x24 matrix, the Fire 2012 effect with blur runs at 13 FPS, and without blur at about 30 FPS. Sometimes more, but I couldn't figure out why.
This PR adds a user setting for the blur amount so that you can set it to 0 or any other value for aesthetic reasons.