Improvement ideas

[vshymanskyy]

• [x] Add Closest(target, e1, e2) operator
• [ ] Allow operators to transform XY
• [ ] Review all operators not to "erase" the complexity of child nodes
• [x] Use some Palette instead of random colors
• [ ] Pick colors based on contrast?
• [ ] Switch to HSV model
• [ ] Add Perlin Noise operators
• [ ] Add Fractal/Recursive operators
• [ ] Add an option to animate the image based on time/accelerometer data? :grin: