[Example] Physarum simulation example

[znah]

Code example: A toy model of Physarum Polycephalum.

[znah]

Screenshot:

[codecov]

Codecov Report

Merging #1850 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1850   +/-   ##
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  Coverage   44.16%   44.16%           
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  Files          44       44           
  Lines        6075     6075           
  Branches     1088     1088           
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  Hits         2683     2683           
  Misses       3223     3223           
  Partials      169      169           

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[yuanming-hu]

Wow, this is so cool! I have a lot of fun playing with this demo. It's incredible that we can achieve this with ~75 lines of code - this is perhaps the charm of self-organizing systems,

Btw, how far do you think we are from this? I tried to increase particle count/resolution but seems to end up with a different pattern. Maybe it's different parameters :-)