Color calibration added

I am happy to announce that color calibration using a color checker card has been implemented in the VDM generation pipeline. The automatic detection is performed using OpenCV and a color correction model is fitted to the observations to reproduce the ground truth colors of the card as best as possible. Different lighting conditions during image capturing can then be compensated for to reproduce the natural colors of the object being scanned. From now on textures for new VDM assets will be color calibrated.