Substitute `^` for cross product Vec2D

re-organise code

Update to using SimplexNoise2 as modules.

Update some noise examples

replace processing constrain with clamp

remove non-functionig sketch

Update bw_shader.rb

Use tap to avoid temporary variable shape

Update bw_shader.rb

Use tap to avoid temporary variable shape

picrate_samples => projects/examples

landscape sketch too taxing for pi