VP1: add new tools to selectively show geometry volumes, and new materials

This MR adds new tolls to VP1, to selectively show geometry volumes, to expand volumes based on volume's name, and to set material volumes based on standard 0:255 RGB colours in addition to the native Coin3D format.

This MR also adds switches to selectively show NSW chambers and supports.

This MR adds new colours for geometry volumes, as well.

All those tools were developed in the context of the development for the images of the new detectors for the ATLAS Run3 Detector Paper.