p5js/mitosis - Add creation of new cell at end of Cytokinesis
p5js/mitosis - Add creation of new cell at end of Cytokinesis

* When the Cytokinesis is complete, separate out half of the membrane and spawn a new Cell object
  - pushing it into the 'cells' array to be drawn moving forward.

TODO:
- Need to re-round the membrane during Interphase, otherwise the subsequent Cytokinesis stage will not find the CellMembrane orthogonal to the spindle axis correctly.
- Also need to properly draw the new nuclear membranes during the Telophase.

brianhonohan/sketchbook,brianhonohan/sketchbook,brianhonohan/sketchbook