scivijs-lib #10058735 New color effects with PlugInBlocks [open]

It is not supported yet to have PlugInBlocks that have effect on mesh colors. PlugInBlock class should implement functions like addColorNode and replaceColorNode, and Block class should support color nodes in buildMaterials method.
It would raise some questions like: what do we do with the isoColor node which already exists for each Block? Should it be deleted when a PlugInBlock which have effect on colors is created?

done in<not specified>
closed by<not specified>