Snowflake growth simulation in OpenSCAD

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This is an OpenSCAD implementation of the Reiter cellular automaton algorithm for simulating snowflake formation. The code can be customized by changing various parameters, including the random seed, to generate new and unique snowflakes. The flake's thickness in the third dimension can be controlled in three different ways. It can be based on the ice density in the simulation, resulting in a variable thickness. Alternatively, it can be set at a constant level or it can be superimposed with a star-like 3D profile. **Updates:** * December 12, 2018: Edge effects were reduced by implementing edge_mirror, which is now available to turn off for legacy behavior. When printing, it's recommended to carefully remove the snowflakes from the bed using a razor.