Remove ColorEarlyVisionModel from topo/submodel/earlyvision.py
Add extra files for color related code
Split ModelGCALColor into two classes, one being an exact replicate of ModelGCAL, and the other extending this class with color related changes
Remove unnecessary comment in EarlyVisionModel
Merge pull request #588 from Tobias-Fischer/errata_color2

Separate files for new color model