fix colour after feedback change broke it

was only setting colour of non-feedback materials when feedback was
active…
reset feedback when not used

wasn’t calling resetFeedbackStack, and even then wasn’t returning to
default value.
better handling of multiple calls to same gene

Genes inside loops etc won’t animate too fast
fix fill colour, add animSpeed to MutatorCommands

was setting wrong material colour property for fill with lights enabled
partially working feedback.

initialise lit textured material first, as that’s the biggest
use un-minified three.js to aid debugging.
add some code samples