Made the new rule the default, but its now easy to play with to adjust the exact color rule we are using. This new one pick 3 values (with a bit of randomness), picks a random hue (then picks 2 more with a small chance of taking the opposite hue), and picks a saturation level that tends to be high.
This fixes#39 by adding a "Randomly invert symbols" checkbox.
If the inversion is undesirable, disabling it will keep the existing creature but remove the inversion.
Note that this checkbox is only displayed when the creature complexity isn't bonkers.
mittimithai