reproduce more attractors

[Notgnoshi]

• http://www.fractaldesign.net/AttractorAlgorithm.aspx
• https://paulbourke.net/fractals/peterdejong/
• https://github.com/beyarkay/attractors
• https://softologyblog.wordpress.com/2017/03/04/2d-strange-attractors/
• quadratic, cubic, quartic, et al from https://sequelaencollection.home.blog/2d-chaotic-attractors/