p5js/voronoi-herd - Add basic steering force to avoid walls
p5js/voronoi-herd - Add basic steering force to avoid walls

* Adds a force (when 'wrapEdges = false') to have the HerdMembers avoid the walls.
  - Currently the members will bunch up in the corners
  - Consideirng preserving momentum, so members' paths curve as they approach the walls.

brianhonohan/sketchbook,brianhonohan/sketchbook,brianhonohan/sketchbook